Malicious PDF — malware analysis report

Static analysis result for SHA-256 207231d69d8f30ef…

MALICIOUS

PDF

75.8 KB Created: 2021-08-16 07:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a19bd7e29dc0cbc00691f5a606a52587 SHA-1: dcb0ba9276679e56b6ddae639d630c3b5b79a57b SHA-256: 207231d69d8f30ef16f8ee254c1cde1cf90e83a42324611cd255315b377d0248
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs point to a common tactic of using documents to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=forza+horizon+3+android+sin+verification
    • https://betalinktech.com/blmedia/file/52425102024.pdf
    • http://erbaytag.com/resimler/files/31695067777.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bcd4f16d1---liruf.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1559093d7927e67c2af3545eb35f825b/maralopafuxabofuxor.pdf
    • https://asesoriagade.com/app/webroot/files/files/8418995687.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d30a14515---xoluwanulimatugegumu.pdf
    • https://rijst.nu/userfiles/file/kolizoviwu.pdf
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/2389168838.pdf
    • http://pumarecovery.com/userfiles/files/gikuriwu.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0bbc36b1c6f459fdf928260a829401cd/95658600410.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/413739586.pdf
    • http://sahrugs.com/userfiles/file/49975398819.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846d5c9cdd8---kefanalupazobeba.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8d595921---93065357451.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/48cc058716f5a93be9d6355566c736d5/66605313606.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b3051eda---fuzuzowa.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc2306faf---44453947421.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/i49jfa0apsf815f671th79jga7/44049132733.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a55063237f4---15879368957.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/tokobepalodutifedesoko.pdf
    • http://carraracucinecomponibilitrapani.it/userfiles/files/65984734913.pdf
    • https://vandolderskb.com/images/usr/gilinuguridaz.pdf
    • http://gojjang.com/uploads/files/16125788453.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cfb58b9b---88074740935.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_off0000c58a.bin
caa0f434866388f50b32554263c5fdc0b3d935353236f738d85ffed2ef62dd83
pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 16876 bytes
font_01_sfnt_off0000f01b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 16792 bytes
font_02_sfnt_off00010832.bin
181b488d481fc509abc0590330282604a79539f44b4d00e0074e4cf79d33c774
pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 10804 bytes