Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4fa2696662b787…

MALICIOUS

PDF

119.9 KB Created: 2021-09-01 01:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5629391b08a715922c956b992a471db SHA-1: ca36b9cdfe6dfb6b095d32365137cff6d9ddca52 SHA-256: 6c4fa2696662b787550437e02ac05478a37408d16261efb9caadf26ff9f60529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicate a strong likelihood of directing users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afabf0052db---14033759694.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/03f9c9ecbc442cb0f3f0a4a2f4bf5f67/votolufitonararipes.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2abd2cc6---51982643829.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/86305968715.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/57861767448.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62d528dea1---gutotugedofifozanum.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184b2bbd43---wenoxekodonerumakoxizupe.pdfIn PDF document text
    • https://sealskinz.ru/files/file/496673339.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/635df3d77c6db362be4752d0b85107aa/51106236939.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/84984964686.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/vinisinew.pdfIn PDF document text
    • http://dd-eng.com/files/files/xanipuwoj.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f281151c5---91983642128.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/mobejume.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/d8rn0npfn9bb44rlsm6tlfh7sj/mukonowesamalakijajimax.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/delegabos.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mm41k7os89qi62dei5jf4krbff/fiwusofabidetelelixeju.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/modosaririsisibilowu.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/zanetalo.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/92982671947.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c8af9a89aa49a67c1e7af7a45b139ed0/82318089671.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/80471448441.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab7dee3db---72013771299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=for+the+enforcement+of+fundamental+rights+the+court+can+issuePDF 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_off00016e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E4F 18764 bytes
SHA-256: 1155d8ffe3a314060da2ff62b8deb8a50f9d901f11b022f6e9f5df154834a958
font_01_sfnt_off00019f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F8B 11000 bytes
SHA-256: 37862d050be57f04f73c0a97a87a9f00daef435ef069d504d7bae17d22082963
font_02_sfnt_off0001b8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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