Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cca92dbe6924836…

MALICIOUS

PDF

93.0 KB Created: 2021-07-01 23:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57de915553b9b815c546719aacae7398 SHA-1: 24c053a3569e01b83c2ba792b01dcd8d0ff034d6 SHA-256: 0cca92dbe69248368827e9b6244f0496df3e88b9feecf62fef7146de029fdded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware delivery scheme.

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://allytemp.ru/uplcv?utm_term=rule+of+fifths+music
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c1e7486c4---35297522768.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba0e71b9f---famureratexep.pdf
    • https://icbacademy.com/upload/files/55820991580.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/66132376124.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/204r5d7ch3qegh215b4c0ijh36/vukonawabu.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f097a0c48---tesuvivezujimigekesob.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb955674d---79259586486.pdf
    • http://mientrungpetrohotel.com/users/files/40164150686.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608168aa3460a---kovimedamiretipev.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/5r4tp18q1nr1uuccs4ucjsnjqa/suwavedupadog.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/vpadlcs0ij3p3m0tc41drh8t59/pixunimixamuronu.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a6894df0b---99951987366.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5102d7efbb46f6fd3769500711c38160/molatep.pdf
    • http://fonnepal.org/userfiles/file/duzudiketel.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/kifumesenes.pdf
    • 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_off00010775.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 16792 bytes
font_01_sfnt_off00011f8c.bin
e8172541c7725089dd4a43a9325e06746a084d0292d4655841b2f7661f67d603		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 10380 bytes
font_02_sfnt_off0001370b.bin
73f322d514c1169031d1f81f77f4e11acb8482507b15551da509b51c9bf787b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1370B 18128 bytes

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