Malicious PDF — malware analysis report

Static analysis result for SHA-256 72761da715f32bc1…

MALICIOUS

PDF

96.8 KB Created: 2021-09-01 18:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70ba0ea027b79cfc0bd39e4004f7855b SHA-1: a1266265f6232559d17734cb916c12cee80d10a9 SHA-256: 72761da715f32bc1f1a1faf5552abec064a2ccfa4ecd1c8d5054c649d4e9c7d8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The file's structure as a link farm on disposable hosting further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/oqui2unin76fb9mdh8210gmde6/52816490200.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125c15a7d2dc---57875536556.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e01c04539fd---narureladimofaguvepive.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/57902024102.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/63152690366.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b52d1a379da---71335279910.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/zekorodilanowezoguxujaxuf.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6770139ef3eba01776fc75fb0b7da834/zutitofudafanefumosova.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/61893803544.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a3dd01dfd---94616248525.pdfIn PDF document text
    • http://ibb-online.ru/f/file/73732252455.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/252d1ae6cf67b3356de85d32c5a28d3f/58841441023.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/21343152804.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd698b1fe3---gosexexupajunuletalire.pdfIn PDF document text
    • http://kasargod.net/uploads/file/rukep.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/wonirufuwi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/955f8lhli4e2frhflpa8hll7d0/vawodezutijiko.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/pijas.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca882a748---lulub.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/15778709695.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210603154613.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/puripuwatasoxoxuse.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/eddcd32ef5d0dae9bca01542923e27bc/vokarepibiwodopuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=poundals+to+gramsPDF 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_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 10468 bytes
SHA-256: 187ca14363af1f0077bacc01074ed0e24004c3d470fa130441223a3843bd19b6
font_01_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14539 18340 bytes
SHA-256: 62ed9ce011a471c3a45c38e3006a01cbac99535b3c14e3b8cdb25b2783a50a45

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