Malicious PDF — malware analysis report

Static analysis result for SHA-256 6040d3290d260493…

MALICIOUS

PDF

80.4 KB Created: 2021-08-28 15:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60105f2a8751a9009ee9cd6b1a275b23 SHA-1: da0fc0cdb821e2bff0a26d84ed36f9fc2185b4bc SHA-256: 6040d3290d2604939050ec3abb0e9819dc08612fd68907b41b39b7b62831025e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://supermarketdv.ru/files/file/reguzediwofakibuvirobi.pdf In PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/55393337936.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/it8v7sqf73cdde0ion2en21hdo/97251515467.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/biluxalunokutiwivum.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d67d21296c2cfbb9556a47ffdbe277b2/nibozadeg.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/62289361204.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128be2e108e5---xukedopulokefig.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/86543e86f4592dbc86acfb8411ef86e5/901842959.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/743261eeddfcec14c6b0067680f534bf/81314064113.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/44bf3f280bb292c0cacaa2371f6869df/26361610269.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/4584815164.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/92896735634.pdfIn PDF document text
    • http://willbramephotography.com/dogitutanowag.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5995acbba3---juzofupiminageli.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/33131731690.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210806215846.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a65279f6df2a9509bdbe9083436f1b29/77981364841.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/29567134494.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/julif.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081253d4de6e---kemonibojofevemixo.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/zuxef.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/simhuqs8295e49s44ip37ou5sp/32883930020.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/vudowozivabudodowomaxiv.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ac02de49d47e9092265b78080ab0a27f/95023414142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=stretch+ambition+examplesPDF 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_off0000d59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 10956 bytes
SHA-256: 629564ec50cb4ac4d6244f6eab533848055830fc376bc73486d5af8756f098a2
font_02_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 17532 bytes
SHA-256: f1ebe8d288a2edc576fd58cb8c8bf206ba0197e96a1765dca64430a4c5928bc2

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