Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b550c8768affea…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 08:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a49791bfe456a12bb99af5a4cb26449e SHA-1: 3cc01cffff5f31eded0de0d76df75da2226e0e16 SHA-256: 92b550c8768affeaef8da3e4613f63b30bd2844ee683eb60b486af74201bb4e5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://fotostudiovaccari.it/userfiles/files/mitewep.pdf In PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c72d06d5---18580755610.pdfIn PDF document text
    • http://raczcsalad.hu/files/sosulusefeburomasosu.pdfIn PDF document text
    • http://selidbe-beograd.info//files/vifidufapekes.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/ligaxefadafepabofuzekozud.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e68f87b5657d64b9775051ffab1ed71d/tavixefuti.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/gubepegam.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610de6770c46b---tezibi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca05d395a24---wajobasalevosumorirog.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/19837976843.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1611b8bc9741ff---gugivesanazupikuda.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f255b27b5ea62e159fb29640b6f87ab7/tawonubazovixokejip.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b83aad7b146---55698986721.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec9d3c6a1---88171151089.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bab29c9d2---jilalirolekiviv.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/snj3qeuckl1n8vijrtbvhn5dqa/29279406484.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/nunimipunikoxuresetezuwig.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062404031539.pdfIn PDF document text
    • http://huiking.cn/uploads/file/022134227377.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/8813940454.pdfIn PDF document text
    • https://tcremich.lu/files/files/86551092787.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd9a751f3---37262573814.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/26076746223.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd863c7e84a---17757411152.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/26903008614.pdfIn PDF document text
    • https://primer-spb.ru/files/files/89031570852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=essential+idioms+in+english+robert+j+dixson+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_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 17072 bytes
SHA-256: 1f7d33b16ab7960f3610d22aa47ca25dcf5d6ac62257e4a0726f2faf6bb3ca54
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 11300 bytes
SHA-256: 36d06ee1872271efcd270a896a3bd4822f7747cdba7bc31f770f338cfc51cd59

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