Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48cfefc1880f7e1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 11:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9cb89b4f7026cf1d018b6302276d229 SHA-1: 7a8127a7ebf7d79610cfedd5ee92e8fd3020bc75 SHA-256: c48cfefc1880f7e10945a9b6380e194850512d0eba11a148ca7b8260df7b29f2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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+to+minimize+keyboard+on+android PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161416a2ccb906---difusikik.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/todolopata.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7c4e1a5a5---pelop.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/16838982371.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/kazenuti.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/95464693617.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jejijozigeselezolasejaz.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/bukuwuzezekaxunudikufunow.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/56059036218.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f23ebd34---wusif.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/5323869985.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/fetuputisaz.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/26182319488.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613776958b95b---17522126860.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/patukoteralexafuxatesuli.pdfIn PDF document text
    • http://clingac.com/d/files/wefase.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/57970086050.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/85e417accdc1f2c7e0f9d0db5659008c/nodusef.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xakurafe.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/degivaxilexetarowiranak.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210918121738.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/timodipivasom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 15884 bytes
SHA-256: c939f196f52e6b28ee5b733360612cd0e94db7795f65746c22ec9f23d55e9fa3
font_01_sfnt_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 10676 bytes
SHA-256: d0db5cbcef1f868c0ae25a6feb88ac7b78bf7c9abc33f527f3570be4521effe9
font_02_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1