Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a959f2733c01af…

MALICIOUS

PDF

69.2 KB Created: 2021-09-01 06:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1b6ffde199af7d20b26e06529c920fe SHA-1: 1387119f2e7c0bcf390fec6373bb98843b4cd5f7 SHA-256: 85a959f2733c01af27a987b50742dec56a82283cd7d47b43504406d422f5b96b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nccrfajkg76bb1792n2e6ss36r/kiwuka.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0503e5a868---9674148023.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/54431309548.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/dedekujuvidurifuminesomi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090953f8d7c8---perifonedulinaturo.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/0b84b677c4c371e8f046c303506c5414/31535831596.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/walerigepu.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/98661784453.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607501d48c156---tikotavamelagebutaveroj.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f680c7be68---41244260924.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/lk5dr5go9h3qaie7ecv6apf2o1/73495110285.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/rumipoxopulox.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/59eeacba433246e9d399f71ba1c4c12b/zobugilawevovimobogal.pdfIn PDF document text
    • https://efnnma.org/files/file/lobikegeke.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/86b93c677635c95464e0da26e07c13de/vejebe.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/48193865586.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/78716633990.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e822526af7---poguvipebow.pdfIn PDF document text
    • https://tsegypt.com/file/56437283943.pdfIn PDF document text
    • http://vo23.ru/upload/file/kamedomanodukikivegalogib.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/kadosodofatizigeda.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/77be909ebe0256f048065e4120668802/mukutivasetewi.pdfIn PDF document text
    • http://tms-operation.com/upload/files/sotewiwufuvovosikovajuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gas+stations+that+renew+license+platesPDF 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_off0000b17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17E 14400 bytes
SHA-256: be31313b8ba6a09e56dde6a91e0e7a4e5342efca78b6d12fa833acc9e926d8c9
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 10596 bytes
SHA-256: 4a7ca74de8228cf3b0eff7e9199f4287be7e698e796d13cb5e79595ba4fc6baa
font_02_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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