Malicious PDF — malware analysis report

Static analysis result for SHA-256 431072a4c2c28684…

MALICIOUS

PDF

63.4 KB Created: 2021-06-22 12:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5b47cc9dadfff905744b95104f30061 SHA-1: 6e1a0d9a3055a070604f8e8ef9260d8cb0270a83 SHA-256: 431072a4c2c28684e16fa95aad9636d9b27d663c49548a1a3d86d124b50d6a27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text that appears to be a lure ('Last day survival guide'). No scripts were extracted, but the primary attack pattern involves directing users to external malicious URLs.

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 https://pixomot.ru/uplcv?utm_term=last+day+survival+guide
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f91972b0068e8cffe50bfd627fd00a09/42220111147.pdf
    • https://pharma-tools.eu/galeria/file/gukelamor.pdf
    • http://dakmet.pl/upload/jubozepokupivepozud.pdf
    • http://ecohost.ru/pics/images/file/ruxoga.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37bba7282a---84147857933.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2f681116771f64b94e41c0c21f85acd9/99562635474.pdf
    • http://solmoda.it/userfiles/files/20088905826.pdf
    • http://igabana.com/upfolder/e/files/20210604112620.pdf
    • https://sunrise-photon.com/upfiles/editor/files/napurorave.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae13df71e64---12459061583.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/64349897347.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/8a85f146995cdbbaf3023a8e7864f7c7/21790847378.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608780faf1f33---45028452722.pdf
    • http://canigrup.com/userfiles/file/49781119730.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0a4.bin
46c6cd5778ad3c44f1aa79e25f87cc63917030467b330465ed7251a1e4d55a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A4 4760 bytes
font_01_sfnt_off0000c0e8.bin
969200faf6b7d247adb24187b1f88d1760a4ad68acf603b1480a1e0736fb26d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 10064 bytes
font_02_sfnt_off0000e300.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 4324 bytes

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