Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5197fa924c1a785…

MALICIOUS

PDF

70.3 KB Created: 2021-07-19 22:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86397c10ea8d3f1a7726c84e085c2765 SHA-1: a6d6d4a9878260cc87f505b91b7d0a6d2a15b933 SHA-256: a5197fa924c1a785b25b18c060e406a8f1347238de57380273034ca014d24f50
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links are likely intended to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4988

Heuristics 5

  • 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
  • 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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e2671468---17980329818.pdf In PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ft8michqv03i3nj8us86ppav9l/xozuv.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/54866650309.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210701002818.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b64b8ea413---74311004857.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a226e992c5d---kavivelipebufaneduzil.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609042355de64---denipotunasa.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/a326ee78688df2733fa23d9562eeb81a/96519481182.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8cqpd0nvqtvfuc3m01c3tapc69/penazuvipuvapuranibapo.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/31336189338.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7321f7beec0475df62d69a01131d0574/panewoxovozoma.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/i7camma7tl9ojk2mrlvqb4f3g1/vurimojiwetinupoledageku.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/vusezimovabotagesovixi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/li4q4vqm5s8o9gsiume5m9asfg/nakep.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/58484820793.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853d909a1c4---wuwogab.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/faninelapimoje.pdfIn PDF document text
    • https://aneri12.cz/res/file/mifufixo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607137ba8d7f6---guzapobixeni.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f7aedf5b521abc9f83624c5c5f5d29a2/pewilugonisuvutizetewer.pdfIn PDF document text
    • https://baongochoa.com/upload/file/45639333100.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/dopowusetamuvagusobema.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/cc21e7cc3163920a827b10eff74e6023/revutidale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=decreased+albumin+in+bloodPDF link annotation

Related samples 8

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