Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d764c69b96451af…

MALICIOUS

PDF

84.2 KB Created: 2021-07-19 01:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1dcbb52d47469b349dea4f4ffa81c42a SHA-1: 24b0fcea1f95620e65a0fcf0f8ea668808ff15e4 SHA-256: 2d764c69b96451af6fd750221afb759fc6109dc09bc5e70574dab2ceb1ede5a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.cdsale.org.au/application/third_party/ckfinder/userfiles/files/rovedam.pdf In PDF document text
    • https://tskrea.com/userfiles/file/25554430934.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54044497c---99427648943.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qepd0bs9faq8ffn1u8n4cabe54/80937695367.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/56500003544.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/671af194606f9299b03e75eaf95213ad/40789176088.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/jopotetariweti.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/rogadanelivejopuwojobibu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vogufanesenesufexotuxixa.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/gipepamigudagetolug.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6950fe2604a8223ae8a5cc695ba07bbc/nulelinonugefebev.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/mujasudagerobamofepowek.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/23009985660176735b24ef3bf99e7a46/kozurilokoneluki.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/44248970364.pdfIn PDF document text
    • https://magatek.com/documents/file/1840828686.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/26957575006.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/fowobawajofikuwajamufi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/f4non7v07sumkt1fc841daqibm/rulomaxubo.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/7111415033.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3721f70af744773f806f3b8b488a7c5e/gaxemurepozasutu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/sevekovi.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/vudetetadeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=factoring+problems+and+answersPDF 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_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 11060 bytes
SHA-256: 520eb642f9a11662261dae3faf2315403ed045431cd816539c851b6b5937a610
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 16608 bytes
SHA-256: 8f1077ef109a051e2e0a755fd5c39fde61495a55813c6c5bb795f4bd10ef96a2
font_02_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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