Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2576eabe0ebaa8…

MALICIOUS

PDF

98.7 KB Created: 2021-09-02 15:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a38ded8b940017fa59bc388b310b24c SHA-1: d588d49b8372707e168f0aaaf1b4e69dd03c27d7 SHA-256: 0c2576eabe0ebaa8858a750878404a398e5f57c4232523810bce024cb3c81433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous external URIs and link farms pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://irlanc.ru/uplcv?utm_term=hoover+smartwash+automatic+carpet+cleaner+fh52000+manual PDF link annotation
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8cb07330---530878598.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/27933142345.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/takafut.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/62662306888.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xadakijas.pdfIn PDF document text
    • http://thedreams.cz/files/69039594879.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/83832104201.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/rikawuduzujezeba.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99002dcaf---84270173332.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd54c8737---vonolojubupitokinimosu.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/ledukisupefuwekuwuwo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607573cfefcef---datikilabumi.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/45df53db03d1ae1eecd0bf632da8c8a5/20008890284.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/dusurolifaripanu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb87d8f403---84055160841.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/najiguna.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/26898572713.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121bea029eef---taxazop.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2bbdb4c4ca3a7ae21de647f465f07d38/xivakaxorazel.pdfIn PDF document text
    • https://iohrp.org/f_files/files/xizevedowerepan.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/gelilomusuvutudade.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/sasijewos.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/53914733702.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/gedokitupu.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/pq465h55neqcah72ntgmkeuo4s/49265947270.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 18716 bytes
SHA-256: 47cdf48497ae9421277e616258f8b5a75f3de518b0557adbe7c6bc3388cb87bc
font_01_sfnt_off00013253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 11364 bytes
SHA-256: b7fbbb313386440585743805a96733839e8ce1f098c50d70af528b7b7e992e31
font_02_sfnt_off00014d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001651a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1651A 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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