Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbad5e179c26e724…

MALICIOUS

PDF

91.1 KB Created: 2021-07-09 00:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 695102e7dbd2c695c08f6fc23787b332 SHA-1: dcfa72f064d4bba962521e78e9e584f1ef1de5a7 SHA-256: fbad5e179c26e724e4b00871d8e0784b85f45a8c7f2002fb0e7815979ceb2ab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious domains. The presence of numerous unknown URLs suggests an attempt to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51bcb7bd5---83904561061.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d51316c06---12551467998.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9791dac880bdd9e30c01c166ebc2680c/tekotuzizakim.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/lobewamukiwupevuzonajuvol.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/jtvsesnn3h4ef8ognheiee1dtg/8229045469.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/tukuputitiparevel.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/rewudiwikatu.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/zubikukigenezefe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f81c5febd---73381004612.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd268ab8ea7---11111241646.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7934146a---letilisekaxuxazujaluvojos.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/71248256150.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/79562810695.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608038b3cea0b---deziv.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27030c821---worazowekudadubu.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/livugotikatuvutisonopu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b227d1c1a0---71092646804.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/co25kc3o42da05sm56nsrha8dg/kepufum.pdfIn PDF document text
    • http://alkanboya.com/files/file///nazexamijuzemowe.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/paramegebexaritixe.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/memizuwunubefufixe.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/58kfqhemi5qll8f3kcsootn2s5/zevawafiwisakubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=soap2day+high+school+musical+the+seriesPDF 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_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 17380 bytes
SHA-256: 50cc7eed71cb84ae9f6fcad698e37f156e9540c2618be3fa18edd979207859e7
font_02_sfnt_off000144e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E1 11268 bytes
SHA-256: c22af2d42d82d4b2ca3b743281d2f21d856ba12f97677625e684caf9419c5849

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