Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4d3891b8e8ab0b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-24 04:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec153ea9300de55f725ca4f02bce95e2 SHA-1: 96db4a5854a81b85d9a6cf46f4c3a1a07b48fcfd SHA-256: af4d3891b8e8ab0becda45aff832fda50bb6aefb673c425c9a8060f756873c8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bonezi.morefriendship.com/upload/files/pedesiwanolak.pdf
    • https://ratodua.com/contents/files/doniwigixulazivazusaf.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4a0258c90ee689a5cd20b434f7abc83a/43517770980.pdf
    • http://elektrostroy.kz/ckfinder/userfiles/files/80914484897.pdf
    • http://haozuowenwang.com/imagefiles/file/48606705439.pdf
    • https://asiantms.com/ckfinder/userfiles/files/bojelimut.pdf
    • https://bursakaynak.com/userfiles/file/rejinis.pdf
    • https://mebelihome.ru/upload_picture/nudinokisipodudal.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac76c1960c---68865819979.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e36b720871---gisagaparisisarin.pdf
    • http://juentai.com/userfiles/files/55613426044.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a406e24c6---26572564792.pdf
    • https://pestresolution.pt/site/upload/file/lenuruvobobevipugi.pdf
    • https://kingcarmotorista.net/uploads/files/jitiwomevisirixobiw.pdf
    • http://wahluenfty.com/userfiles/30664815033.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be284428ca---9564238381.pdf
    • http://eamenfaraz.com/cache/fck_files/file/nobebagakoxelalixolodi.pdf
    • https://atl-50.com/files/file/79498393782.pdf
    • https://amatnieks.lv/pictures/image/17153770700.pdf
    • https://martabaktelor.com/contents/files/43452459638.pdf
    • http://chineseclothingonline.net/File/47759243965.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/38815494665.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=clear+history+android
    • 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_off0000d6ed.bin
a13a83b608375613a7e6d9fa90ab9c7ee00ce7fd2b3d2e7b17c559ff64a5c1f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6ED 10488 bytes
font_01_sfnt_off0000eec2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 16792 bytes
font_02_sfnt_off000106d4.bin
c0fea4c9dd41ec69a545cb762340eae1dab25b135d6b9b6ab10d3d3e3a89b91c
pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16360 bytes