Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4e0f5412f491c4…

MALICIOUS

PDF

63.7 KB Created: 2021-09-13 22:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 87a882ee5d85c2bb634ccd7e3848593a SHA-1: 07c12b536182dd6898e9ef971fa7b4662f1989bc SHA-256: 8d4e0f5412f491c40bb4f7905f8887362265866ba143792447b4c05e6da61f89
154 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS upload storage. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

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 https://gyn-koe70.de/obrazky/file/91764717478.pdf In PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/sufigotisasaz.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/54885581638.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d597aa95---49863839088.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/23089137052.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/11916802521.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161320ce08f0b3---mofijazarelozobudulur.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/divogebodaxegewopokiz.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/12449411313.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/4687830711.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/rogubi.pdfIn PDF document text
    • https://medpressa.ru/files/file/71891932741.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///52132504564.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210905015543.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/wepelupexusozo.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/43236362802.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/fevinoserajif.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/lusibafotivibukuz.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613049f079844---rilodurefuvobuz.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/12907212930.pdfIn PDF document text
    • http://splogservice.ru/content/files/tefapazinapajetazunum.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/7221323626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+free+robux+easy+no+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 10968 bytes
SHA-256: ebd5125f6eaa5a84d66a816c7d35942f576e04232cd869ff74164b86b2f5d848

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