Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bfd43ae97dd192…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 18:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f578a398560ede1ccaf8f3d0717db14 SHA-1: 66b314cf5864ba69002a4fc0e77ac42d8d5866ac SHA-256: f6bfd43ae97dd1928b0d84701f356b870f1ea2b843ac4527e2c12a25662b86e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160adc2baab51f---71062004740.pdf In PDF document text
    • http://viviapalermo.com/userfiles/files/toginenozijiwe.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/3391757548.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/31719539437.pdfIn PDF document text
    • http://hnspkjx.com/d/files/somowozajix.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/fisil.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085b9b7b4837---24628415924.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a24c352964b---veveba.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/96459341018.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160760b94e6601---73390596555.pdfIn PDF document text
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/fugebejovinedesefape.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/nekiku.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///wilememuweza.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f1af09fe9---pozixobiporu.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/35615739071.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0c87fc70041f86ad780b3a590c1075eb/23609779492.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/zawuxojukasavom.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/33627819371.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/wokupikuru.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f04885fca1---jopojowirefulibogap.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/nesuserufekojo.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/60931316666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=advanced+onion+routerPDF 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_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 10296 bytes
SHA-256: 5cc90bfba84725c4b3c5a838dd5ae043b278bd7e2e7845740944218e040dd040
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 18052 bytes
SHA-256: c65bd83708b30d2ab092d8800cf8c0de63a4ee0a63f165fb2192a137b887740b
font_02_sfnt_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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