Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6089827964cd7f2…

MALICIOUS

PDF

89.0 KB Created: 2021-08-12 23:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3dfcc6d3b95ec854f1ec3ee48d3bf2f SHA-1: efe7effcf7b93189982b30a4b0eb2e70e4dcbf36 SHA-256: c6089827964cd7f28e0fdca1d34a7250185b61824d9d6ae54fa1bb2b0aa52508
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

This PDF file contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and the nature of the linked URLs suggest the document is designed to redirect users to download further malicious content, likely a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/d180jpn46l3numj8uvq5gcrgv4/sukaroranuwimiwuniwam.pdf In PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071947f610c0---negepalirewej.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/xuxuxumiga.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f5ab19fe---18992188284.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/43005156315.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/82573544756.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6276d572c---minutid.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff903e1933---xetoxapixuv.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/8betr67drfftnqcd6p4e7e622n/21863238610.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/wawosusir.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lpca1snp9fbrfar0ttq9hucrs5/nawavadakisikivaliwule.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5725d1c98c---53856460673.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7j285u410h7bcp4s4cnjopcnlm/sugamet.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d0116e76---sarisulededimovemakexo.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/fubefarepomapima.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27aa7e52b9---10806319822.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ojk09g715gsv7rbfcitq4pue65/81585793457.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/39633015425.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/sb8pm7gf21mo2msipfnhht4uc1/daninogofimafovubejow.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/posatosaf.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/pebekasanoge.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/7317642717.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625457519.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f50de303b35103333deb9821d09a54ca/42318867533.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098e802c18f3---27859374998.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c4d4f5e39012c02bd2460303c87d9c2e/bevuzofifid.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/7b8a851b62fadea5506989552f79070f/moriwura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=balanceo+por+m%C3%A9todo+algebraico+ejercicios+resueltosPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 11432 bytes
SHA-256: eae160d3d4599d846a9946852a68b23767ce206abbb76b5f52f1efea3c4c3337
font_01_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 17452 bytes
SHA-256: c031791de4ff20658ef1cb55fe4f0006e86f90a1724e62fec2f818cdf31f2491
font_02_sfnt_off000139e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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