Malicious PDF — malware analysis report

Static analysis result for SHA-256 507e9a1cee2224b6…

MALICIOUS

PDF

69.7 KB Created: 2021-09-15 17:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f72bdfb1d5d59e656f8cdaa0fd78c7da SHA-1: 3cc6cf7ebfa640981d9cf8dc5f5c70daa494966d SHA-256: 507e9a1cee2224b68e347a4cdf8f139bd651cf661e58c55cdc5d991b150744b0
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. This suggests the PDF is used to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://absoluteanytime.com/media_file/files/files/pikasomujovonir.pdf In PDF document text
    • http://tranindo.com/Uploads/userfiles/files/36540102048.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/76868440146.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/86187761559.pdfIn PDF document text
    • https://wmu24.ru/media/file/jopegoxafenizovenezu.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/rarafe.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/jumule.pdfIn PDF document text
    • http://partnercable.hu/files/61913489066.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/69051365462.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613747b390bc0---vobaxotubomekazamerere.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/70d2b9a9c28daa9790ff2d206d2989df/gowugogujozetezu.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210909/file/16311961172486.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/73672773512.pdfIn PDF document text
    • http://recviem.ru/img/upload/pafowude.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/vusoviwofagogomujixubojit.pdfIn PDF document text
    • http://flomojapan.com/upload/files/17388957150.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aff57fa19---93737164781.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/firs89jv1gu5gdhgolei7pt1di/femujowazawujaxelorujavol.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/jovasedexinad.pdfIn PDF document text
    • https://rajaunited.com/contents/files/suwoxufaxazaxade.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/85377047719.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613156322bf9e---towirinalogeruseza.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/79032474855.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137914284acf---26300157880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+gaming+phone+under+25000+in+pakistan+2020PDF 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_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 11412 bytes
SHA-256: 5647de2ac0ac8fd2318f0b1a0a4b37a76d357080ae83a5691772845a0498db99
font_01_sfnt_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 15072 bytes
SHA-256: 91fb7abbdfa1b3fba6457a6475cb75d45aef26d2f16a2913b1f4e5aa7b416caf
font_02_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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