Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb72230d12c0d92…

MALICIOUS

PDF

78.7 KB Created: 2021-05-28 13:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d523cdcb50cdb6de5c1943e6a2d59863 SHA-1: 8a8a94993db5400a12d1f9cb0581b71ef56c862c SHA-256: 0cb72230d12c0d9232738ac6fc68d2e107a19492a7e293f1216fed0018926ac3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of these compromised CMS upload links suggests an attempt to disguise malicious redirects as legitimate file downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80a15b6ff---28126670910.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/35d5a8d51e5c22cffecfc25710c3d5eb/65667477798.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/en5t9q4o4gtuarcd202alb2s2j/vonawalifitusijobuzit.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/2440d6ce660a0267d6be7937fb660846/tewijutitezinimog.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fisixawapevavaxukizeki.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/15866b429bf04358e89afb88d9cdda45/walilajuzidexesunukozumag.pdf
    • http://promador.pl/userfiles/file/legekagudarosovebubodik.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921532d4cbf---29776324797.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/smtnov367lm6c1e3uftegjskl4/murapuj.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/oo29fcd6cc36vp45gkfmovs4eb/siribevikubebodozesu.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759d0899a9e---xozisipejo.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a852a1e0e75---fimidoxuperi.pdf
    • https://dacinsara.ro/fckfiles/file/61012601426.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3eb2qvrc432kt4jdsg1jasvstu/nirosugakuruliniguki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=%25C3%25A9valuation+4e+r%25C3%25A9volution+fran%25C3%25A7aise+et+empire
    • 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://scripts.sil.org/OFL
    • 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_off0000dc02.bin
0422107fab3e2473b1933712da8fbef24166179260481466f5701d174ad466c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 5496 bytes
font_01_sfnt_off0000ee77.bin
75ab3eff2641607ecdf334df3a473be70a31d2e65135fe4fd87789d3ef083799		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 12396 bytes
font_02_sfnt_off000115a7.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16204 bytes

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