Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec80127e28ea5df8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 10:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2217723a638c21eed06deb7f30b5ed81 SHA-1: 11db3e20e7bf81a3f68c7f7b5cfa1408dc67b391 SHA-256: ec80127e28ea5df8fb6efbb689e556a2a3c5dcacd25cd9fa6af800810d82693c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or link-farming operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=comprehension+passages+questions+and+answers+pdf PDF link annotation
    • http://penzion-u-zamku.cz/files/file/12549908479.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e58e6c15---kozenabutepirajipuxil.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pterl2ntgdo298and9efq93b27/wudewupejotiwib.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b198b2b16ed9b131eee657f799b837f1/77422506743.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/87761303874.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/25404696898.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e10a9e69203---11138271647.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/sevofefepukofutagikikog.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/japolenapibunuxoku.pdfIn PDF document text
    • https://hoongnau.com/upload/files/29902090646.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/66917493448.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114548fade8f---borid.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-25/2108251954339081635g3y92kxd4w3.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/6mj9fal09g43uljmnl0r6mhg44/mukugadoperaduken.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210822125631.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gjj55c9i2upl4dnminsid0s5ks/50685843852.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/nukobololexivuxupi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27342cf01---dulodibegewugazimisu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c03227fe---wureduparalixewejef.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab786cf56---87090359652.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f3665a85---pazusetodadofugilijubav.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2mmlf51515n872sihad6t4m4ah/16275796265.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/duzizuw.pdfIn PDF document text
    • http://slsnn.ru/content/file/xugejusa.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609738f5bfe69---sipumifusenimitenow.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nblum9b4bmq1k5svvpm5amjmnf/85159028703.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_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 16776 bytes
SHA-256: 1642466906a1b2cd756b8db544143535b1714910483b860d8a706dddd019e5fe
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 11264 bytes
SHA-256: 077132413a815096fa3aa824637683c7f006df8a3ea6ebda4583656b95fe0a05

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