Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb3b54e22198428…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 03:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc53b299b085102ad74aac735322fd1e SHA-1: 18a6bcacddeaad82a3e7e7d93454a5c12b16b0c5 SHA-256: 3cb3b54e221984281f35693110ca650f8b38ade84c3055b70a37a681a7d0697b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate the presence of algorithmically generated URLs and link farms pointing to compromised CMS uploads, suggesting an attempt to host and distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141eea8740ed---91789979213.pdf In PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/kuralor.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/14577875286.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/78185780032.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/belejuteb.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/kazikepejotavage.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/18515481515.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/82309015945.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/62212456968.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/labusugadoranekazikofom.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414bce4846a---xazevuzinoboma.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vruq4hsnin9ndecslcr8mfc298/87642314824.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/67927790876.pdfIn PDF document text
    • http://cichanski.com/Upload/file/70824174125.pdfIn PDF document text
    • http://freewest.at/muwegodepebotobazikuwot.pdfIn PDF document text
    • http://hidramaco.com/files/files/fewolaripemovesotoki.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/dedamojokopa.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/sigexi.pdfIn PDF document text
    • http://aprt1day.ru/file/95063754945.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/34553316744.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/26614021735.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/gipilebuxarovimixi.pdfIn PDF document text
    • https://nyig.com/files/file/dokojewe.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/30435702970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=up+animation+movie+downloadPDF 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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 10444 bytes
SHA-256: 757ca79bcdefdd7c8972ff829b17b35369bb281dfb85df799d6fb17987bd3b09
font_02_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 17608 bytes
SHA-256: a1f1d3379b93e3de76d229fc140b4ca9959cc91d9d2b4e01d3ad5c11b60cf66d

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