Malicious PDF — malware analysis report

Static analysis result for SHA-256 f477539205b21ede…

MALICIOUS

PDF

92.4 KB Created: 2021-08-16 15:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3452062d9a6d4ad1247574b1f8e23004 SHA-1: 42479ae9d914c06b4621bb71814d54746c45ec8b SHA-256: f477539205b21ede5983419e9336e790e70f1aafc60d8dd281231104afbae6dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://colakcivi.com/userfiles/file/58037728768.pdf In PDF document text
    • https://actor-conseil.com/files/file/solizaginabikazu.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/15936265573.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/22104979884.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090bebebca85---kevemex.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/b95ops8k2cub20utc95bp2kqut/28313741177.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/21as5rignvu0ejje4d2qgmci83/39736167556.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/95394702914.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/getuxadawinolulasunazut.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/vewulaboxepukazikiz.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/380eb3c0c8bd194872ac4beb40c4ea8a/makuvo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/f6v7lgshcn71dl8q0rgpcdv628/teturifosigatoxovag.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894103b5339---60265889967.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749ab1b98ab---wokuwuxonuzovufuguvosi.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/12283804168.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/kb1cqfbf807qfkecl6h0988upm/rerolixulumiwumotobida.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607987205580f---kavuwusisubizikuja.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/koxoxedofoxagekawer.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/43487100425.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0f4b558dfc26d56834074e9c55935e62/49765939675.pdfIn PDF document text
    • http://doellefjelde-mussemarked.dk/images/newsmail/file/80980356340.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3768d4adbfc1ecd51f75fb3e98f19ef9/41744688384.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c7768a1aab9b80066fe5cf0296c23030/7558256219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=simulador+ser+bachiller+2019+inevalPDF 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_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 11380 bytes
SHA-256: 8c47cadb9749611ac2ca7c605698a56cf80623f4381a18485e7509d85c4b169d
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 20096 bytes
SHA-256: cbb08320092b503b71f042cb186a7cd21a20e89c31361d174ab237784ac00208

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