Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1ff252c04c542c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 19:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c2466828e166ff51f81ecbcd544220a SHA-1: c6fd143958323d4cc91bd1aa2c698daf6577c23c SHA-256: ff1ff252c04c542c0d812ebabc227980888f0e87d7350a9a5c76e395e72f4603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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.
  • 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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4ba8c742---xizipo.pdf In PDF document text
    • http://khonggianmang.com/upload/files/28824170396.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/kavevexaresatu.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/jorexonopuxobusalejujanu.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/jebulitotovusirusi.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/tuzatojexemevekawovid.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/26501664446.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/41416401314.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161384d511dd9a---21550682517.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/gevigesedawelotijekov.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/semewibelumikurasadoju.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/pavijaga.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/rolovax.pdfIn PDF document text
    • http://d-innovation.com/upload/files/burixijixanapaluxetopoduz.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/kuxuso.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2bb51c8a---26601955666.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/bozesipiluki.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16137cbbc0630e---pedirejifut.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/24524479750.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/32232120158.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/ripagevotep.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/manasilavaro.pdfIn PDF document text
    • https://actorconseil.com/files/file/38933543290.pdfIn PDF document text
    • http://serting.eu/userfiles/files/99536055479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+store+internal+storage+to+sd+cardPDF 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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 17692 bytes
SHA-256: cf7012312f3bb4a136bc2e5672d3e2fb59945e7799bd8cc40745d745b0d384c5
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 10624 bytes
SHA-256: 9bde16045aaec9da3f2d5f69ffef056091a675d73ab3d9920675ef1ab929fc02

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