Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68609dd95876c48…

MALICIOUS

PDF

78.3 KB Created: 2021-07-09 16:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1468f4a6772bfc47de609e5e663fc739 SHA-1: bc9593ef7a3adebc963a2c4d094a8e20a1bf7034 SHA-256: c68609dd95876c48552d39a82694f44a86e1a97a13fae3594a9d9d1453700aaf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://softwarefactory.nl/images/file/puxidubi.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd1aab2a42---34287351882.pdf
    • http://infrabud.eu/fckpliki/file/nepafukosevatoxasolif.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3509557689---27921559937.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/grsj0phlct6ee02dfecdf6deq4/4883494604.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/nokofababezidujo.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae94b5878da---92944729033.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbccbecc86---8137544923.pdf
    • https://bawwabatrizq.com/userfiles/file/pamolefekonis.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816788f1003---jizimujevefejefibureme.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/lobanebuloduzupofozawex.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/05fd3664faaf764b57b0bf4e9040660c/zaserij.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64885057d5---nizumovikozimalirutirik.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ebb56fb9---nokudarezazajikubul.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc44f4014---guwegi.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/j39iva560mdgn920hvoscsh8n1/nazobakeredaxafarawilalak.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ca927a3e81f8f3c08080690134f2370f/gerudosogen.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071121629818---nofobovamiradexulatepese.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/tk2cfe43vg84nffgd1d6m39c80/2791484400.pdf
    • http://asfus.net/virgsurv/userfiles/file/nowapejafawarane.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ec655e561150b8a2e093ae9581408a6c/vaberufisawadujigujaxebu.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a015cba28e5---lidijexejusiwizawoborazi.pdf
    • https://living-stone.lu/userfiles/files/zezasiviteze.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d845a2dffe9---lazaxafot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=conservation+department+near+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f0.bin
4ba3907398c66d64bfae0ba3431401259dedc13a59507f7d5a628b314f2119bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 10604 bytes
font_01_sfnt_off0000e93a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 16792 bytes
font_02_sfnt_off0001014c.bin
9b57d31ed41c878650412fd31616bd6af442c3eb84e4ec0b2eaf0847ba154493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 16476 bytes

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