Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea54c89e520f003…

MALICIOUS

PDF

117.3 KB Created: 2021-06-13 21:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 628274fbeaf24f37eabcfef0be888881 SHA-1: 4d215015f7c266f629ab412d2271a96802ab24f3 SHA-256: 9ea54c89e520f003e5c947b8c0fd1ca8cf9dcd77ec4ca262cfb223067c204457
154 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's likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no direct user-facing text is discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9046

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=overlord+anime+shalltear+bloodfallen
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d2114694---49133149771.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cffd88bf64bc0ada015dbe83d89246e9/4004167353.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p5d7ocj5s99s8k9r8a6hrjk3ca/dolawokogajuxotaxij.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/7chfmarpo04ecomqka5obrs7a7/63756584134.pdf
    • https://davaocarrental.com/images/file/40042264562.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/feruwol.pdf
    • https://tatsolarlight.com/uploads/files/82490074248.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3141c17e86c6e24988a3fa256d612c0d/7943648197.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/5kp06t01tera3blhbr0kbedpt0/54391631670.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0353e538d900b59d08b49aab616e82af/26073076975.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/l641shcefavhaqv6qop764v7e4/99246860064.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/t3l28ocp2kd4p05rcdqhrg2o29/lefusaruwemu.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9cb1bd2a3797b1853f885e396762b76e/dubudulaluvuwuxa.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/31b38b1bcdc3614a6617f3c6fdbf56a5/tazogezadokubisovu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab6d.bin
9c88a74b18a278d144af74a9de2ad799fb7b5255d2778863ad83da50a0f403db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB6D 5172 bytes
font_01_sfnt_off0001bd4b.bin
2068f2f3b3397a40da4fd67c1aef07c609baa46860dfc7110408cd02c331f4dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD4B 5376 bytes

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