Malicious PDF — malware analysis report

Static analysis result for SHA-256 6015af716975c6eb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 10:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d7ea426b231958925ae72cf8ac5c64a SHA-1: 3be8912c442a6f574a7ce597476c44653c8fac22 SHA-256: 6015af716975c6ebc01e587b4a9e7aa328b6855c7ce81e34c6dfae54325526f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users through these links, potentially leading to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://rjbmachinery.com/d/files/fafefupifisevoradon.pdf
    • http://hitecds.com/userfiles/file/gavadegisegelen.pdf
    • http://12shio5.com/contents/files/suvodad.pdf
    • http://www.guus.edu.mn/ckfinder/userfiles/files/84621626848.pdf
    • http://thecargonepal.com/userfiles/file/95088090573.pdf
    • https://linkevicius.com/upload/galery/file/pepuwizujefamedet.pdf
    • https://bandai-k.com/userfiles/file/34987358480.pdf
    • https://huanghecables.com/d/files/74890387035.pdf
    • http://lsneotek.com/ckupload/files/lujiwefut.pdf
    • http://autosvilar.com/uploads/ckfinder/files/268137142.pdf
    • http://unitekinfostructures.com/userfiles/file/31039593751.pdf
    • https://wisestudentz.com/userfiles/file/joxunoxuzap.pdf
    • http://tomasmrazek.cz/userfiles/file/69311742050.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/69602120892.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f527c2a7---vawuvit.pdf
    • http://austral-immo.com/userfiles/files/mexebokuwifurujatuze.pdf
    • http://fra2ange.it/userfiles/files/golovozakiwomubuwudirav.pdf
    • https://27061010.com/uploads/files/202109041321514461.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb5f87769---93977349738.pdf
    • https://akapacha.com/userfiles/file/jujonupisuvukuxopuxaza.pdf
    • https://bucatariizidite.ro/printuri-fi/files/17523049987.pdf
    • http://skyrybupaslaugos.lt/uploads/files/vajudaviwakunonegixivi.pdf
    • http://vector-food.pl/userfiles/file/58242143669.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/gabubaganowidu.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613674c55d103---musoxamuko.pdf
    • https://refakatci.net/userfiles/file/fexizivazov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=d+major+key+chords+guitar
    • 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_off0000da9c.bin
555416a737f32a86c6e5a3d31d14f13e1eb3718dab7ae1e62a6db48be0d8777f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 17988 bytes
font_01_sfnt_off0001093a.bin
616d628e71871d78238ac1a3d632d714d020379452806c746d04cca7a02159f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 11104 bytes
font_02_sfnt_off000122f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 16792 bytes