Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae36e9e7e85e0934…

MALICIOUS

PDF

84.4 KB Created: 2021-10-07 23:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cfa28b2b594290fa7fc761bb8a4e80a SHA-1: 55362e70abe9ab3b855a6153679a39f7481d49f8 SHA-256: ae36e9e7e85e0934533fd8e260827ea4df28ec54bde98695915b3071b4e29357
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 ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The primary purpose appears to be facilitating phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=how+many+carbs+are+in+brut+champagne
    • http://htwy.com/upload/file/pininipibizasunetip.pdf
    • https://isabellepieman.com/userfiles/file/lefifukeze.pdf
    • http://tafgambiatours.com/userfiles/file/mizimitofasakenafe.pdf
    • http://linker-apps.com/files/66399826632.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca837051ca---33569287449.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lob0ndc7s67gembe5vrb7og6f7/30974830963.pdf
    • https://tannhatviet.vn/upload/files/milugod.pdf
    • http://viprealestatebrokers.com/userfiles/files/zuwevowazapu.pdf
    • http://olgapolyakova.de/files/files/4161967695.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/54678096610.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342b9632e75---rekibu.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144660c8145d---48799813843.pdf
    • http://tythb.com/uploadfile/files/sanezodivimavepefu.pdf
    • http://suliaox.com/v15/Upload/file/2021926193119154.pdf
    • https://cambodiadriverservice.com/userfiles/file/76697114090.pdf
    • http://studiotecniconuti.it/userfiles/files/92125639041.pdf
    • https://torbay.ru/images/uploads/file/terako.pdf
    • http://gzcil.com/uploadfile/files/vajesutikabudo.pdf
    • http://castel.lu/userfiles/files/57764334612.pdf
    • http://dar-tom.pl/userfiles/file/75540710580.pdf
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/78074156578.pdf
    • http://namngonviet.vn/user-/files/dafodogi.pdf
    • https://clubesolbra.com/uploads/files/nozemumazuneravuv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e163.bin
a4209a246e6c6dbda5bd4ae61ca40b5a226ab9fe1dcf36ba36559fcfd1b8e429		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 19172 bytes
font_01_sfnt_off000111df.bin
74b0aa2940a3531db5f9bc5725af9c9b17a14ef767db5c81c4fddd8e4042b911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 11208 bytes
font_02_sfnt_off00012bc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC9 16792 bytes

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