Malicious PDF — malware analysis report

Static analysis result for SHA-256 571fd8fd4565c334…

MALICIOUS

PDF

93.0 KB Created: 2021-08-30 18:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ec48976b621ed081170b51d174e1be2 SHA-1: 3061a63698002c652966fb9e9cf5f738bb121ec8 SHA-256: 571fd8fd4565c33458b6553c7e4fbc5a1e051c2a4ae35a11df80634c16edfbe9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or for SEO manipulation, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/43171d42d5cf62767a11274eed03bfb7/28131956187.pdf In PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/68692064670.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/fizumirotupin.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/87237732950.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/pejimadususelakifevu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160759da720ca2---68561130671.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/cf5f9993ec6308ffff6b8348112f89b9/zodejaxiloposemotuwevixix.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd19da7384768c607ee01b2ed6ab58b5/90915410512.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f64f10867d---lufaz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774a3c6db3---wusabaxuribi.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/44409215124.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ab14343d---gubosutivugogorumil.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4fb99a439---557010373.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/widitasuba.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6126b1e496---safusizijejafewevifapog.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7aba7989fd9f15a665133caa023863b2/40471978523.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/supaninugixiloxekid.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16120ee6607d1a---39294004502.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/6761341244.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f3f6b16c32da4bb460cf19a0a574fc17/mulejebokag.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612175ce6057d---ritikobajazutotuten.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/zawejadekolaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=beautiful+names+of+places+in+the+worldPDF 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_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 11124 bytes
SHA-256: 127c370dc9013c159df5acd71065b7a204675687812b9b26662598a2cb3f56cc
font_01_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 16948 bytes
SHA-256: 2d58d5fbc9b44579366c2bc4fb27bb15bd79a9bd621cac3a45e2feb0c48f7420
font_02_sfnt_off00014dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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