Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bd6114df78789c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-01 11:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96d8ff3f8e7223d7c07948fbdf31a31d SHA-1: 6d17f54107d038a5ede7d7ea677a0d7eeea4bb83 SHA-256: a9bd6114df78789cd3853ed23c7bd43e252bed5dc7eda0aa113141b6cdd4d29e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites or other disposable hosting, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leoclubmarsala.it/userfiles/files/19071795932.pdf
    • http://dansecyr.ca/pdf/file/61537011029.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dbfe8efe59---54600733886.pdf
    • https://www.stock2morrow.com/ckfinder/userfiles/files/55111908483.pdf
    • http://gandolfiarchitetti.com/userfiles/files/2252418796.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/fb6204aca869d75413ab109118851e95/tafitorifesegonar.pdf
    • http://cocoal.com/uploads/file/96992418658.pdf
    • http://shsclassof1970.org/clients/872719/File/mezadifurexasokufe.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1ba090e4a31a31f9084edc870d93cf80/62167597462.pdf
    • http://alituncer.com/userfiles/file/57200990935.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hhs6dlu5dvhnkbecrsgclcorbo/gufewopakelijepiwibadov.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b889c8b97c6---40289265293.pdf
    • https://repetitorebi.ge/userfiles/files/65037081539.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a09505b7cd1---xebuzosulanopofifazi.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/vabilobepalusufotamakun.pdf
    • https://motodubai.com/uploaded_images/files/16394383248.pdf
    • http://titadoorbinhduong.com/upload/files/nezatagofusavidixa.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f454216fb1---50614372476.pdf
    • http://faw-asia.com/image/upload/files/41031621981.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/budotaru.pdf
    • http://meble-tk.pl/userfiles/file/gunizez.pdf
    • http://ipea.kr/userData/board/file/24436542616.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bad+time+simulator+undyne+fight
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b782.bin
d0248328891f461d5cdd7ce7168dbf40630562de3e75f6220cb9c6e743454c69
pdf-font-stream PDF embedded font (sfnt) at offset 0xB782 11068 bytes
font_01_sfnt_off0000d0ed.bin
13a5d21cffa1cd5f670b3ce85766235bdb00fbf0a7c0ff2b1bb67744e675cf8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0ED 18148 bytes
font_02_sfnt_off0000fe84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 16792 bytes