Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e76593289862664…

MALICIOUS

PDF

93.0 KB Created: 2021-07-03 08:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 587cebc8c309add72244d4de2799bd64 SHA-1: 9a8fb06a6b44bef984e4165547b4057e1f2742e5 SHA-256: 1e76593289862664c96213a2329d2c7fcac59248a1dd7631354d4ea7432c8783
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of numerous URLs on potentially compromised sites indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160795cf68aaf8---jenopudumisawisosa.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089e786d2fda---luzogelutolidulumesof.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8ktrm2tnghg2dmu6rhkl7d99k7/45242771494.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770b1704e43---kuzamefox.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/masota.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/vosofifikekejekom.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/momonubofagatu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/re9seebd6ssgbqr9116toc19ec/87580283512.pdfIn PDF document text
    • http://ridendo.cz/files/file/65361726306.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0a8812db---lixawijomukenagaj.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/a624f3586a099737a6b82b51412c36a6/zexigexevemoxesofidufozun.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/foguka.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/fopeboliwosavimulukasubun.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/nagavutatama.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/defofikexik.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ac250c38---24873245803.pdfIn PDF document text
    • http://msiutilities.biz/documents/wirorojavepuji.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/809cb70ebfbff7fcd2ca74ccf9a9f517/zetapofovaxixu.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/habbvbjnjun2hs5ogmp3li18hp/razitigurur.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/dizutixomuvemidim.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/abf0dc7f4c67ccb8b2dd64ad828135fa/xunabelumujijolewasol.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ab934bace---gipixufodavezonivifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=different+colours+synonymsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d27b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD27B 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_01_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 22612 bytes
SHA-256: c8e160c2eb1bd02896ad55d6501b06d2fef93203b967723fa1550671ca43b2c7
font_03_sfnt_off00014033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14033 10552 bytes
SHA-256: c738bef6e7e31ef99e09bb0cf1d69ba9ff42171003629925510bf0c4088fb5bd
font_04_sfnt_off00015846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15846 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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