Malicious PDF — malware analysis report

Static analysis result for SHA-256 a942fabeefc62db7…

MALICIOUS

PDF

92.4 KB Created: 2021-07-22 14:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ac32c81ec47d8d961730ff1a5235761 SHA-1: ec1a6e3c238874dc711ba52e108f9afc2f2ee452 SHA-256: a942fabeefc62db7d799be672c5ca66dc6fd5002add192441d88d5f4c85f9340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The PDF structure and embedded links indicate a phishing or redirection scheme, likely intended to deliver a secondary payload or lead users to a fraudulent site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c1067b2b3---121859138.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4831a37dcaa1285a1ab426914da74dc3/42703846032.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/hps0udf6lb7i8cqvjt4b29l82i/18607652748.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/3246762686.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/69048165454.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3e2efcf8ff5fe855bc50fd832188363c/jutarodo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bad8285561d09588c09e2b6bdebc5a6c/mopezivebepafufu.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/84435676489.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/42194447248.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/25751269110.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbab9b71cc---gekefajatevutomojarizedo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/o621r5ub1ljq5adjp6b8l3f5da/katomojunenopevesil.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/70903457773.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086483aadba1---godil.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/48828751918.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/89076717667.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/42142269834.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/tefezata.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3a9b76cd6---11003031904.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/vokozupedefug.pdfIn PDF document text
    • http://safarang.com/basefile/files/66929595559.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2e18b0291531e854c4e9a6c09e9b660c/652611241.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/merasidalawibonobazem.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/929d87ebfdc28520cc60610d1bb86da3/86710371127.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ff8494f9---ruxik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=another+word+for+beginningPDF 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_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 10464 bytes
SHA-256: 7e95fb3f0d0628ec3fc6e94a8cf59bcc1945163a66d271ed4845fd7a8e175b6f
font_02_sfnt_off00013710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13710 17024 bytes
SHA-256: a276d373993ae9bd630146c047a42a5ec1c236f5e9cfa170eb3e5cc78634c5da

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