Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1eceda79f2463d6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 10:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50907f8a159129d5c7825fe348469bfd SHA-1: df5954ecf400bccee2757ed3f1da4590edef0cb1 SHA-256: c1eceda79f2463d624ea267e71161f615fb00b8853edcf5276fdc6f6be3d0a57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially malicious files, indicative of a link farm designed to trick users into downloading malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive download lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=dj+studio+5+pro+apk PDF link annotation
    • https://sanvexe.vn/webroot/img/files/lamafew.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/xugiv.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/rulesufikoj.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/zasomunezivejarobexaz.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/86223577686.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/juxewogokapodirikasavug.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/xarevesikututobejaxozo.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/pepativuja.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/26964239930.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea2ff2358d---94341396437.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/30697836770.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/13768062487.pdfIn PDF document text
    • http://jinyezi.cn/upload/16804957281.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/69848069345.pdfIn PDF document text
    • http://itena.si/uporabnik/file/53083282510.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/jexasagevasipimugorisaj.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/19964053983.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/81a5c889236190e0a0273150a0394692/bukifubiredegotekizebeves.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/mepotat.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/770aa4e507322a7c65ff8e9d000c5a35/52192376341.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_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 21156 bytes
SHA-256: 78abd0f4c941c8858b479f69de619f88fbd9aa9cdd7a5edd856932558b5958ec
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C5 10560 bytes
SHA-256: 248d1b7c2aa37e49e848987e4f9313983518c88b281be948bd2e0d4f31dec201