Malicious PDF — malware analysis report

Static analysis result for SHA-256 2988f5d79fed3a0a…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 11:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97df99c75a957bb8df5aebc91663fcaa SHA-1: 9facc05ce0d52af41f9550345a73edb4bf81a443 SHA-256: 2988f5d79fed3a0a5aeda3ed966a3b4bb9b0c1b276cf480c5965024038c63fc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload locations, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c910f254348---62244993600.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090bd4a247a3---wujodupafuwebuwobupewo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8e49i3i48gq0tqqie1mm1hurtk/zabizenubodedax.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/kirivepaxoxetaxezaze.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca39557ff8---zalosusemesafagufugesem.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/vowevizinivi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083388fada75---17626808206.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76a7948a0f---liwipezojij.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/05d00efc2dff4354832724dcd383c147/80793089102.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/95832442470.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/24593110113.pdfIn PDF document text
    • http://midel.me/userfiles/file/jipufuvojulaluz.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1200345bf16c72031e8b9fba96bd9962/77762099688.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/120214366043.pdfIn PDF document text
    • http://contactconfiance.com/files/files/jazolekejofalinixuxo.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/001d6d268becb997461c3f9cd16859b0/godunolekebimakavezosu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a791f58b697---73046947169.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c9abce40c24c166310e97ad260c2e8ea/daduxi.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/24f89b3f67e60977e760d833cdcf058a/75730257496.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cd14c50d33ab9232f77772241fc52936/vukoketagixuwapitigure.pdfIn PDF document text
    • http://megalaserasia.com/upload///10878995839.pdfIn PDF document text
    • http://e-hane.com/files/gopenapuji.pdfIn PDF document text
    • http://innotack.com/userfiles/files/dusufapagevewisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stereochemistry+of+bromine+additionPDF 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_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 11024 bytes
SHA-256: 2b6c661474d2991ce1663520ee247d22379df40f1ee5f5286b9ca97f98ffca99
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 18096 bytes
SHA-256: e92ea2adbc19be6ac2ac0fcbd246bfa7b8bbddb4781ae7d4f42c7715acd2bea2

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