Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8cb62c405ee84d…

MALICIOUS

PDF

93.8 KB Created: 2021-07-27 12:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 01c29b6dc1071ed4b1178c32b092b4ea SHA-1: 29c872d651e4adb784e940781bf6bcedc6f0229e SHA-256: 3c8cb62c405ee84d4ce5bf236dd094943e4451f381f833baf7b3c760f2e76b88
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through compromised websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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://agrocare.hu/ckfinder/userfiles/files/58831503366.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/i9gomagv02907qmr3vpgv482id/84356211233.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4999c1a13d---18727022829.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cde3a838b15665a23e37a21487e76080/simufedomenulamilox.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/zazebe.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/94666221364.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/aafb6cf987a17d24c957663d3a6a076d/87590273473.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/nijikuxu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6b423e3d98db5f6853f60310b2e1c67e/59033311131.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/68825594217.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d637d0eaad6fc6038548c20abc3356ee/89286383044.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d634acd462c---vazojusezibowunedovaboxab.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/42838169557.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45f2aa408f---fogubavewesebedodowude.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/88967276032.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/7576053135.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/64648325131.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/834d5baede7f73437a3d2089f036d3e1/suvurafirebopobo.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/20633885817.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/26914590111.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/62ed2859306c08e8143d5ae54604a04c/jelarabol.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/9kmp24obcbascrnl16seitgrh8/nujepavasibar.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac91c69d1---xipidovanakonesobux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=max+horkheimer+teor%C3%ADa+tradicional+y+teor%C3%ADa+cr%C3%ADtica+pdfPDF 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_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 18176 bytes
SHA-256: 6482a35f33ca4e51654fcaab775ab6ed5947a80f2a6b0728dd9606f3d7388b7d
font_01_sfnt_off000133e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFD 11080 bytes
SHA-256: dd0165c6a640770f386d15eb53d1990c63cc35aee10443c0382379b0d72958dc

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