Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef914c22ff74a0c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 15:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 262e607203c2c5d47794332e2aafed44 SHA-1: bc07f38d2437c6ea4822a35e64710c9fae71c66d SHA-256: bef914c22ff74a0c3236afb323dd15ea740a4d20797349b43600c2fa743b4c8e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or is part of a phishing campaign. The file functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337573723af---74073104536.pdf In PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/xozituxobokopigidita.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/60381124129.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/61264990258.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/xixemofojebus.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/97142756282.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b453edb11f---97187224488.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/mujid.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613397e267f19---22897029009.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/wegonusogowugatuxivikizo.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/71296500124.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/621uphi96vc50fm32etc18j6h2/12834363095.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/sejuvudadoloxujimat.pdfIn PDF document text
    • http://esipro.be/userfiles/file/mijosupak.pdfIn PDF document text
    • http://zimmerei-possert.at/98852829915.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4c7a9de1d---sixasenas.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/33690197692.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/zameloviliwitil.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96brksonjmk85nfgqosep9kjg1/14549987696.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50186216433.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346d4c59eef---nelel.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/bujozifagulebibubadazuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+10+pro+32+bit+pre+activated+iso+downloadPDF 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_off0000bf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF14 17696 bytes
SHA-256: 83bd205974ff311c3b401d9087147bf040c5790092eb705739ebc9058da26747
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 11260 bytes
SHA-256: 6c82f5015588705baaba3a50d170724bd7a1f18e2f03be6ecc598d8a95e82d65

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