Malicious PDF — malware analysis report

Static analysis result for SHA-256 51aaf92b33e10973…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 03:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f94c6869b22d6d114f5e249bd1597ba SHA-1: 5bdec33070b52e4385e9eeea0112cb2d214bf4fa SHA-256: 51aaf92b33e109739bef6578a4471164e134df0fd944be0c58db05e899da52e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e68a7e8a219fc5246e543b33d3f3d51a/33061570956.pdf In PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/xepevaloji.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6c04898c764bc1e7259ec1c3e8b8156b/56911281417.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/38b6145f02a5a063d6aa95f9f22c3bf6/gaxomajinifib.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/tivulenabolebuxiw.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cb1d49eb047ad7e7a9a8bb58a60effd/47950385349.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608194490db1a---77949167838.pdfIn PDF document text
    • https://blugarden.eu/file/58111343361.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/97388db580c19d9d94bd61b976c00f3d/62309716974.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/81003162436.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/59788e194fd65021ec2168d2300fbf25/tugipomepi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160824f34dbe30---38119801789.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a263ac2071---tevaxunodopuzowesaw.pdfIn PDF document text
    • http://safarang.com/basefile/files/40275187893.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f9b87adf3---vemolawagetirujelot.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/pavimerusivo.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/5re3phqa8o0t33n2q6q5dr75ut/zopure.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5be33d336---vegesovijuxunixikuvoj.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/75c857f66e7ae24f3404115d2c2e6c97/tipokesuturize.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f676f89747---13780458859.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4bddcf3d16ca5d16923c8bd358d32a34/80563661603.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/wixobozunexuvemusivurer.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/zukevote.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a24ab197c0f3d1cfd608ce98c4f1c3a6/befiwetogumesobawufex.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/5611711017.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8ad427196edcc5bec9becdb8e47615e3/67507985196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=human+resource+management+terminology+pdfPDF 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_off0000c9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EF 11168 bytes
SHA-256: 1c853c32330b3cb7cb99d53e107dbea3a26e855e14ca968146b2b82f86bf631b
font_01_sfnt_off0000e3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 16000 bytes
SHA-256: cb65c785485222496fad036c759c8a33f7242e1fc4693f49c59f64ceb9646b1e
font_02_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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