Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9670a6139c4103c…

MALICIOUS

PDF

91.3 KB Created: 2021-07-06 13:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 6e3e8f2b3bc5dea51abf924a7ea93c45 SHA-1: f81910e3647e7e730bf3966949db9e9ecb619e39 SHA-256: f9670a6139c4103c0086328952bd706d1994fc8aad58edc310492fba36c1564a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to further stages of infection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0fa084e9---80642572292.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fdf7a83115a794125387cae4c6a63817/13026819428.pdfIn PDF document text
    • https://rajaunited.com/contents//files/jenekovobabiduked.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/kunadumaxidoxino.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/gojexilagezoni.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/79280180218.pdfIn PDF document text
    • http://absigorta.come/file/najadabosofiniweg.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/godurisevalimotapa.pdfIn PDF document text
    • http://zerosquareonline.com/file/sonajefor.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074468557bf0---46534268753.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ee927b184cfdee566d15599e859eed2f/55850603065.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fa59f231---60104800597.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/d5l4iv7bta6ea6en9866aeko24/86011206264.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/23lt91fvp3odh7248fktjpnffe/dituxefuguvusipago.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/mafefiwukirufegunovu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h89hduba1rs7am56om287n4695/xodunutikapod.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/bofifezuruk.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/52778744835.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/roxegimovegojusajaguvagef.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0acbe06e36f9c90e1de915283b7cdbbe/novon.pdfIn PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/60509865554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+under+the+sunPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 19600 bytes
SHA-256: 210c8eca4fcbab17fe892498aa39ddcb6369b878b8969df1eb072014565a8a89
font_01_sfnt_off00012ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14815 10680 bytes
SHA-256: 74f561670cf655554068c0df3d424e84300491e928dfb74f947027845c90f88f

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