Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9b7b68c374c59b…

MALICIOUS

PDF

78.4 KB Created: 2021-06-07 19:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bf5c5547d12241a61b17483895525d02 SHA-1: 495eb6065994a74e3a650ca26dc0ab5bdd1f79e0 SHA-256: 2b9b7b68c374c59b692a45a810fb17724ba8de495d50261a0a4047cc4dcf9c01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malware. The document body, though heavily obfuscated, appears to be a lure related to trigonometric functions, likely intended to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=tabla+de+las+funciones+trigonometricas+pdf PDF link annotation
    • http://ledseoul.com/userData/board/file/77782090475.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/kebametebis.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c76eaabcc1---fivisego.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/619a49a1b74b78034d0ad6c0adc92a08/wezasetu.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/woxemipofusuxipes.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qadu8g1loe8acu6tpkc71pjuq4/komimolejorizit.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/6hg7b471qgrmaaf9qs3ssuf918/duxebulijodironol.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0db2cae8---xaxowumoxowam.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ed238553a---46359309917.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/35195606083.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/pepuse.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607601030bb4e---30061005390.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088969041dc6---20397334629.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/76604110959.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 5564 bytes
SHA-256: feef080cc9b0074ac2fdc91dfd97329b0e62967734a39546b96876191d4d1f59
font_01_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 11024 bytes
SHA-256: 441aeac3c8059752c4f75bba83009fcd92ecd0b7414b8103e2e7919340801e9f

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