Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b4d2c71a1d44c5…

MALICIOUS

PDF

40.0 KB Created: 2021-09-02 13:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86103400f9b98aa30b392474f7ee2c1c SHA-1: b5ead3b1626beca6972d4dbc3357e8707ad277f5 SHA-256: 87b4d2c71a1d44c53a7dec9cb9066c8c7a02f0df915432a399e9822fa7b3051e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised WordPress uploads, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be an image-based lure, typical of phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=whitsun+weddings+poem+text+pdf PDF link annotation
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7b9c27564ff93acf2eb606fa0d069b60/36367920328.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/6237275486.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/89571292201.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/5e7955d08bdd4708630659a1261b7ca9/86507487617.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a9610eb8f0c4816e8deff97256751799/25010500403.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/45918688576.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/acgksj78lndnfadl9ct3l91bdq/tabomojuvikaxateze.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/vinubume.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a063fd4c6dd82f6d153801a3cee3c656/waroxibeves.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/vivisozaluxogufutovize.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/gogazipukigazowut.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bifaledosenopaw.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/87096380685.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/daa4a5ce83386913ac779f9ca634e865/luguzijipumamofufaniwazil.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210522175545831.pdfIn PDF document text
    • https://t2sc.me/userfiles/35168119350.pdfIn PDF document text
    • http://machin.kr/userData/board/file/79386118290.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108220731438185.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/32601635432.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/coIn PDF document text

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