Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3741c2e53579f5…

MALICIOUS

PDF

75.3 KB Created: 2021-07-13 22:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b6cdcba83837d2b053f9deaeab8bc7f SHA-1: 3b28d9e1d2c125187511700b6d4c0c4704ffb744 SHA-256: bc3741c2e53579f55760ac494fd410282e21ceeb73dbace4abecb7d50fe08087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=walking+with+dinosaurs+chased+by+dinosaurs
    • http://uelzecht.lu/userfiles/files/81158552114.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0365fa40c456c7b5610fe989a4af01ff/besivenilirovadivoregeb.pdf
    • http://michellesmithscott.com/clients/36670/File/36209156440.pdf
    • https://mepho.hu/ckfinder/userfiles/files/72430750772.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a25ba15f7fc6a1ec3978486a0c59b662/87284395509.pdf
    • http://bettynblue.com/upload/fck_img/20210512/file/93119475551.pdf
    • http://henanshuangxin.com/d/files/63203904130.pdf
    • http://inciboya.com/resimler/site/files/33352893182.pdf
    • https://happycolaborativo.com/uploads/files/57307989419.pdf
    • https://ceccargiurgiu.ro/userfiles/file/48944030572.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/43bd73a41e1b243cc83e25c334e7e1cf/fokixifinef.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3i6bcckgh6apu3hsk154gbpbi4/63687527284.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d56e66dcf3---ludusafumofomoletolod.pdf
    • http://bagiez.com/userfiles/file/gotaxijosisosek.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a79c10cff3ca8f66cbe7591d3278851e/76697523783.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/70752959105.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/59588605938.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d3a2588ccb2f9fafccb1a79f41ff4a1a/65515518169.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5eea8c425---19013208442.pdf
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/murodi.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c80e321f23bf4e766be2c4a62e472368/garewazunigo.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/develag.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafb2ea8782---mewinozuwa.pdf
    • 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_off0000c0ac.bin
36797c5e9be925e6177bcb117a9313d0080c977bf96d95525cebdd7c60c4b282
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AC 11172 bytes
font_01_sfnt_off0000da9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 16792 bytes
font_02_sfnt_off0000f2b1.bin
e30d33643d921661abb08968feec7fb2955de6cf5a8bf2faf2287312cb9b6b36
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 17508 bytes