Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d80cc3686567aa…

MALICIOUS

PDF

62.5 KB Created: 2021-05-28 22:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6964c6901cc4de311c05fbfbb321f64a SHA-1: af96a8e3fdf329fa61680bc4fb719331c6260ca6 SHA-256: 28d80cc3686567aa1e7832afda23a3c80c8ee79368ab214473c879f822eeb12b
154 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various websites, some of which host further malicious PDFs. The document's content and structure suggest a phishing or scam attempt, likely aiming to trick users into downloading malware disguised as movie files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9400

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://micast.de/wp-content/plugins/super-forms/uploads/php/files/4l69bk1f5du7ggjisf9lral180/vutekajipagutebu.pdf In PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/dorop.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/24a324b75c1c540c8a2d8af2337b71c2/89601872082.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfda185870---67979010457.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m1k4u8tai21k7kelqlst570roo/dajelenurilodunonenu.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/3794403900.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/s1t1vqkult5gk9rmhaj8dohu54/zaraguwatez.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/69fecf8283b8cd9f55ee814c368c6266/77447568994.pdfIn PDF document text
    • http://unsersohn.ch/images/file/wezemugoriworag.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/12fcd1644d5abd378568682ee235008a/rugusiwafure.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b6d9dda40e459ee3f4e5d5ccf41f5a81/83322299217.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4995697660---1186214483.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pudagulijimabisexezaxeme.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c80ecabf---gelejore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=top+10+movies+download+sites+freePDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 5272 bytes
SHA-256: 535ca63edddfd7fd7f5ddb1473446360eba141d8d86f58dfbcff09c2055cc912
font_01_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 1804 bytes
SHA-256: 559e339ebb012a4711299e9f436f2accabb026881398d3942dea161b76ad44a3

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