Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe99efd5677e9be…

MALICIOUS

PDF

69.2 KB Created: 2021-05-01 03:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: e575c59b13e2822351eedad6c0e0c2dd SHA-1: 54872850522437742109ba991e70a27c23cbb782 SHA-256: 6fe99efd5677e9be4eafeadc8bc6e4de0ea79d9f4fb0d7ceb2e78d459a6ce8e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the heuristic firings point to the document's primary function being to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7936

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb059e036---vovugosadokasag.pdf In PDF document text
    • http://alituncer.com/userfiles/file/xiwituwokixuw.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/545de9348e46d8ee2ce4dabf47af36b6/4195920519.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16088f76e71083---83279637646.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/ripaluxivuri.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c25767396c0c67190029667adb61e79d/wefevej.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/q3v69dimrlp9a6sdjpdjcjcpvd/zasevopejegi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608119b9d6be1---66883527734.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607629e2af1ab---99652452738.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607331fb39284---48322217859.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/trhtotq4kecmn3j1bumohb7qmv/mazidewutubaxavokuv.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e69a8d23fa83d94d949b40e727f18890/17227275136.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5lf74tqpld2v5vi5afa7usbgfi/77701205000.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab9a876a0---26691942360.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/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+write+a+fiction+novel+pdfPDF 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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 5084 bytes
SHA-256: 946258d372eea8225225f173b0b11750e845430bf32b9df572f13d57e9b35464
font_01_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 10404 bytes
SHA-256: 67907d4d1de4d63a4e6ce111a1e8758446a25ede64c7689d7510fe5829deb9f4

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