Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af74ffde6ef1e27…

MALICIOUS

PDF

87.1 KB Created: 2021-07-21 18:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1daffd0fbbde133e5bd2264fa9f9222b SHA-1: e6aa80332246524c70c2e1bc4905653a49a2faf9 SHA-256: 9af74ffde6ef1e27a040de2f7799669a262b0fc965c2ff683b7bd170cbb0f68e
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v5mu47p0ur5415jvm0g3h6ik6f/84164303414.pdf In PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f554579183f39a6e2fbcf02ce0845531/kewirinexupofosu.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/lovuzefer.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/41479081579.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/135a912e9adf49c00d39516bbcaee4ae/53705553013.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/13994583675.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20113010300.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c3b461eb9---tidewuvesixe.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/50595879074.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/kumil.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/71554545794.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/zuzovarasavid.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/32484077134.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wajamoxikatipisorexo.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/lisuvusokar.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/38490922554.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/58684107178.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/dumufelirewamipumarifebeg.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/c509sopg0dbcf1sfjhcghi1i42/91422497064.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6n5tc2nid55a4cdbrds08fbnkc/62857349666.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/81075c1133d024ced123551462c53495/99229980782.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/scpb8j0ium6a3ln440pd4r13u6/83770003999.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbe3d8f21---7657754472.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cmhhiosvd6l74f4rf35lclt653/rekuwotuwalosojabenidud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=shader+pack+for+minecraft+mobilePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000116aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x116AA 18980 bytes
SHA-256: 4ca653923d962b49b0fbb4cbd9eba6ebb3c680287191fff16da4e67621d407ba
font_00_sfnt_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 18276 bytes
SHA-256: a9181f936b9ea4b55275a16d1d78be3c10926634fff9863d71fd6bbe3ba90251
font_03_sfnt_off0001351c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351C 11024 bytes
SHA-256: 5fac3e079858af8f2bef28175105f5d5ba99f0096e513e56f1388d3a4ac056ba

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