Malicious PDF — malware analysis report

Static analysis result for SHA-256 85df3c5a2e4a1501…

MALICIOUS

PDF

82.1 KB Created: 2021-08-27 16:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32a6572b5d1ff1008ff5e83bc65ea7c0 SHA-1: 0ff644bdf5c84dd89a2ffc6ed52c5d16eb01facc SHA-256: 85df3c5a2e4a1501316918f2ec624f148923b145d2a7b3dafed8a2bc02da8784
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://universal4shipping.net/userfiles/file/gukuwalizunepegozukital.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e2ddeaf87---sezuselinijowul.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/30220314384.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/106d41000276173a8963b0c2f83c9d41/besavazinu.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/56909789539.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/tekosavovavivixugus.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/46945672791.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/jojepuwumi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/02e869ff13c8dd1db8c4f77c32e7b7b9/wegawe.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210827_81DBEA946F2AD08C.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/misipomasuzisipuro.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/62888b4015e90468195368e33616f049/tegekezidigojo.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/kusufiwojili.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/1921070601.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/98734875115.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/99936454492.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a257424ad---96346869674.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/37745802662.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/bfa5b2d583131be56e5d0628d2e75dc0/32099082448.pdfIn PDF document text
    • https://manenshop.com/upload/files/39435610546.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/60486611448.pdfIn PDF document text
    • http://aquatherm-graz.at/files/nibatiporovilusut.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/pinolewipusibagigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=class+5+evs+question+bank+sa2+with+answersPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/68a3e843dd57b90d0378ce9fc1717409/98686370874.pdfIn PDF document text
    • 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_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 11120 bytes
SHA-256: 14ddc53f1899b4328e8b81a20da24a82e29feacdc728a57845b86a788a2b996f
font_01_sfnt_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 20008 bytes
SHA-256: d4d3ac8b59017dd1c78022ecc5626e5a8d60c9bb6c56c4d8a2e45a8e25d15502
font_02_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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