Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e046ebde6b8aa2…

MALICIOUS

PDF

110.7 KB Created: 2021-07-23 16:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccbeb35c3b440a7aaeb4e6a7e7921078 SHA-1: 27342618b863864305b9ef501b6b3e1e395d9447 SHA-256: f8e046ebde6b8aa256f4b46317235c6cb9778266a28e27c6c1e016a9b7d991fa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://sunwisechem.com/Uploadfiles/files/25420848483.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/98429759597.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/rotupaputa.pdf
    • http://nhactheducthammy.com/upload/files/zutuse.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/85995192005.pdf
    • http://dlt-nkp.com/fileupload//file/tofinosojotap.pdf
    • http://richmediahouse.com/admin/uploads/file/solujur.pdf
    • https://mimpiindah168.com/contents//files/17195445571.pdf
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/19380124026.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6un1hieqird5vdkj7odlac9i4n/levipuvolukis.pdf
    • http://holidayservicemarsala.it/userfiles/files/8917497953.pdf
    • http://keifo.ru/ckfinder/userfiles/files/damipa.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f10d52e11---83722046722.pdf
    • http://ecohost.ru/pics/images/file/19316149280.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/43ft88unvtb6g2i03jn8etb0o0/77772611458.pdf
    • https://aljazeerahdrilling.com/userfiles/files/dinigide.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f12d2fd864689a0e964885a09e9a060c/tefigizox.pdf
    • https://bonekarusa.com/contents//files/27605085898.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1fb56c65f---87689565755.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb9500196---62219821199.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/8c7448be3b1b5573cfd3d47ed614fe18/90063705285.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/554349981.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=are+1990+marvel+cards+worth+anything
    • 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_off000149d9.bin
83e154f1eaf839fb148e4460d9cb7934973b267855ca010639e27b8b7eacd5b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x149D9 18364 bytes
font_01_sfnt_off00017a6c.bin
7ddd05397b891708322ee689fbd3501009809051cb91b18fa0de6fb75b66a36e
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6C 11404 bytes
font_02_sfnt_off00019522.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19522 16792 bytes