Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6288d51832cdae8…

MALICIOUS

PDF

59.5 KB Created: 2021-09-29 00:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9709801229b9e7cba1ddfd96bf5d5d8b SHA-1: 3a1f9839f6d06bcf6ec07412f9530f393ad712dc SHA-256: e6288d51832cdae824ad66970f1b3a5e4918eb32ce0c1f709d6a4a1d1db23f43
154 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=harga+android+samsung+j2+prime
    • http://italiangreyhound.pl/img1/userfiles/file/kaxidafanebajipixover.pdf
    • http://zl369.net/userfiles/file/75911496025.pdf
    • http://market-oborudovanie.ru/upload/file/gizofeketoxakukalupak.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141ddc693811---3043771623.pdf
    • http://cascad-trans.ru/files/42048600940.pdf
    • http://otohondamientay.com/upload/files/vikigipexetejumibipiguv.pdf
    • http://hiro-seiko.com/upload/files/5660579942.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/sogowu.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d6c5494fab71fbfa87cbf85e2b27a704/tedenevune.pdf
    • http://lamexmarket.com/uploads/files/95641347619.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/90727954631.pdf
    • https://juhaszautovill.hu/userfiles/file/22110980125.pdf
    • http://abnig.friendship-match.com/upload/files/10406301266.pdf
    • https://marblo.com/app/webroot/img/files/42061169706.pdf
    • http://influences-vegetales.eu/assets/Image/files/81623359544.pdf
    • https://aakritidigitals.com/userfiles/files/90535746424.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/tarodixeki.pdf
    • http://veterinariacomportamentale.it/userfiles/files/16946134052.pdf
    • https://mattress-leader.com/media/ronulefebomigejopitin.pdf
    • https://torgradio.ru/new/files/file/wabipofikegexadinemav.pdf
    • https://vgi-vn.vn/app/webroot/img/files/53173546069.pdf
    • https://pacpartner.net/images_client/imagesfile/dosojivusosukewuzirulirej.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bdd9d4775---73296716930.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adbb.bin
889c66abbdbad0cdc7779121df6ffd7c29a041548ff964016538f987cfedfbfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xADBB 15380 bytes
font_01_sfnt_off0000d3ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 16792 bytes