Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29bdb9fb7258417…

MALICIOUS

PDF

85.3 KB Created: 2021-09-26 12:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66e6c952f3b61b035fe75a4c2c86fb0f SHA-1: 088aa2deb92c672e5a43cb2ded3ecacbd9237b42 SHA-256: c29bdb9fb725841746b4094fbf08b248d52a64de78759f0b020442201b156035
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=quay+phim+m%C3%A0n+h%C3%ACnh+tr%C3%AAn+android PDF link annotation
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/98557745185.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/59394354020.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/93427366456.pdfIn PDF document text
    • http://freetds.net/userfiles/file/6192950783.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/tevizosevebetibil.pdfIn PDF document text
    • https://menu2uplus.com/images/file/74567550263.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142465c83fb7---suxodetomiwozinevoboko.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/figozigubuxotoveto.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/fododijolig.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/80568290823.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/79319982315.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/88125508357.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45392633894.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/33298022376.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/bepixedutobopuge.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109071447154686.pdfIn PDF document text
    • https://efnnma.org/files/file/lutodivebosovan.pdfIn PDF document text
    • https://purefeeling8.com/data/file/fovefirumep.pdfIn PDF document text
    • http://rinsacars.com/files/others/72437385717.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/136a6a383603501366b09200b0df8f96/rutuzopimimenokinuwom.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210909_FDFF3DAE098E9CDE.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/28672296113.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/47933720521b8c68f995a2d2e24514e4/64142779603.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/barebosogixiki.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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 29328 bytes
SHA-256: 825f916fd377aa712e190a48cf4b4add6ad88ed2d0dabd275c10b55ac1e9efc4
font_02_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 10992 bytes
SHA-256: 1f0624b51c4566f61e2142e17dba75cf1ce449cc3988569d8e229190c52a6ffe