Malicious PDF — malware analysis report

Static analysis result for SHA-256 521fed41377d1d0c…

MALICIOUS

PDF

87.9 KB Created: 2021-08-01 01:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85da1e56e453d9a09282e5646ec93f17 SHA-1: 1dd56f9aaa099bf832b28cd94108bc798d54ce16 SHA-256: 521fed41377d1d0ce85785af09c30e7ec28879ac52ed2c511e5463b751a44ae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=catch+me+if+you+can+movie+download+dual+audio+720p PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/880be00fe027f87ecd8f4f44ab6540af/morofasinenufuno.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/934d392552e34214314e2938736f26c0/23615744834.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/et3kq26hrcs1f9ccab10sjoki7/30277994663.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cd3689fa5---lulezaxal.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/d83pstkojbk0ldj0h1llf5ciip/58625689096.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/sulegagamid.pdfIn PDF document text
    • http://df-2.de/images/daten/file/wituluze.pdfIn PDF document text
    • http://paliukenas.lt/i/File/53806265006.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/dogonujiguredefajunufofo.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/rarizulexepazixav.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/20135435456.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4c565bb50a951988018f515fc5847f13/38150769314.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2f29a688---71025116498.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7918d92a---tikozopitirefopujasane.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/66980774618.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a413b90d778---vaguvikaragotal.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba541324f0---33164820789.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/915d11e3d4d443e144290fe7d78b4184/67082968014.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/621d478aa45afc543e2a62f09d60b4b2/75728385940.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/59274acf6f8e10439c3a4db361c929c9/pizov.pdfIn PDF document text
    • http://prosquash.by/data/romabutilud.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/13799969786.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/90139093290.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/21266353858.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_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 11304 bytes
SHA-256: 3df0a68c6424848a357fd8e3d64a1a192f56c7db3982e24f3b707ea3024eb9d6
font_01_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 17268 bytes
SHA-256: e123026e953c58f7bc1f06d8f2620871c85a80256f465b1dcad9bdc06d0d20d8
font_02_sfnt_off0001388f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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