Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf11ffc66425fed…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 16:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cf9611c077562993c0d03a2d3b7ff06 SHA-1: fc2c47a5041ba60a0243152a2d620ba0ddc29f44 SHA-256: bcf11ffc66425fedb710e0300c2438f490a17e5a3bcd5ea40ee8fa2509f72b67
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document has been identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to numerous external websites, some hosted on compromised CMS platforms. The document's structure and embedded URLs suggest an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=icons+for+android+studio
    • https://fundoohairstyles.com/hairstyler/images/file/13130012230.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613485b22d09a---sorowokotujujesix.pdf
    • http://manavpublicschool.org/manav/userfiles/file/32648848390.pdf
    • http://theofficeplus.com/userfiles/file/turibagaxolanubopurexok.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38722658512.pdf
    • http://gzbaosui.com/uploadfile/files/rexude.pdf
    • https://xuantruongtech.com/images/ckeditor/files/71913851000.pdf
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiloxunojokabukisativi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fb0aae041c026671877e79bd4e421347/32637975915.pdf
    • https://kcharp.com/ckfinder/userfiles/files/fufewexonokoxekifemexe.pdf
    • http://tv-kitchen.ru/files/files/mujosiwivodadedave.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0948719d408252b441c19432ffb8fdd3/zabiwapiligerepofif.pdf
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/48776148725.pdf
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/ligagudum.pdf
    • http://holzbau-napetschnig.at/wemabujoxufo.pdf
    • http://sun-green.de/ckfinder/userfiles/files/67647078898.pdf
    • http://stomerijindex.nl/images/uploads/fawabebesojiloketuwot.pdf
    • http://oreoltour.ru/sites/default/files/file/8819973970.pdf
    • https://blnk.eu/userfiles/files/gebawosirudanivuze.pdf
    • http://cocoon-source-harmonie.fr/public/file/xudoxi.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziwipivutotadupo.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/panugefejomiga.pdf
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/gikekazamo.pdf
    • http://gillsandgeckos.com/userfiles/file/15138763582.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_off0000e337.bin
b480c3ffcfe3d870a8a8ecab8acb1f5710b25078dde63b32e92d715748245bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 10344 bytes
font_01_sfnt_off0000fab6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 16792 bytes
font_02_sfnt_off000112c8.bin
24ec5486486ef211205e5e4505e564a7abe1bc5218503fcc7d4fb38b81cac13a
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 19596 bytes