Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79c6d16ca631e6a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 07:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d03954cdd5a7a4b188f44e43a33f92b8 SHA-1: 1f5256f93b3a04a3a2ca828a3798d07ec8171574 SHA-256: c79c6d16ca631e6a848bf46d1c94f7ca26bd6652eb05132eccfb8f5a411e2ad1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple external URIs and link farm heuristics confirms the primary function of this document.

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 https://wastran.ru/uplcv?utm_term=scoompa+app+free+download PDF link annotation
    • http://tianlanip.com/filespath/files/20210903142427.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/xisovakudojefojupina.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7pfvu8iq6v8a0nufuqlhk36111/gataseb.pdfIn PDF document text
    • http://micruts.org/userfiles/file/somiseximutubilejera.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/xonutidabuberesuwo.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/zulediviwux.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/gabelefoxiwedokux.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1f7bc05f---silutenap.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/36086793630.pdfIn PDF document text
    • https://deepex.hu/hirek/files/jebunadunawololupefu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a074f567---40898275180.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba3531829---73077006815.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9794d9eb5---tavone.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/nomiforobilomawakoradax.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/94846079040.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135427b1bd4a---61024268842.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/sinede.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/gabulajegetumikujotibabup.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/supebutepobegupenebeg.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/62653186833.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/vuliridegadizurelu.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_off0000b91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91A 15928 bytes
SHA-256: bf5e11b604185786a1ba4a354c6849c6caabff4985cb5e97a39dbb174aa785ee
font_01_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 10584 bytes
SHA-256: b5112e0ed3abe42131a20c30bbbb40a3e08a291b4f17101648dd60ae796735a8
font_02_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1