Malicious PDF — malware analysis report

Static analysis result for SHA-256 10377bfe41cd6c85…

MALICIOUS

PDF

90.2 KB Created: 2021-07-19 06:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 041bf4446323b8c2edf3754163bad736 SHA-1: c473a36f518ff2cc4633fa93e7a3ad4ecab06467 SHA-256: 10377bfe41cd6c852d5e32b31369705b8e9011f5557e922bd9fda854b645e7de
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, indicating it likely contains exploit code. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm. This pattern is commonly used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://wagnerpc.com/userfiles/files/6814555559.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/932b6338c5aead25b7826f8cc1888a80/71443436887.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9223fbaebe---nizorebugupaxeze.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cc0eb1888---39122606295.pdf
    • http://scamps.biz/userfiles/file/88292063359.pdf
    • http://malbreil.com/userfiles/file/66301510402.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/a8qet8bngqm5te40g4c5me6cdf/texexilu.pdf
    • http://paradisetnl.com/FileData/ckfinder/files/20210629_CFD96D8ACEB3AEE3.pdf
    • https://proxus.nl/file/17860978193.pdf
    • http://trendybiz.in/usersfiles/file/84336315462.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac6c69970---bixomibuxobuwaworikile.pdf
    • https://cottonweb.net/userfiles/file/vepudenaramexeju.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d89f46c00---10888629495.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f205e3b06---wugogin.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/medezizofevofez.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/21817465088.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d24d867fb61---59892200328.pdf
    • https://dgssu.com/upfolder/e/files/20210707135602.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fak1dkbktfjl08rppb4n0jpljn/lugevu.pdf
    • http://z500.si/files/xarirozopaluremipafogev.pdf
    • http://isystem.hu/ckfinder/userfiles/files/golawuked.pdf
    • https://asset-books.com/userfiles/file/gusigetodepegugujababu.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/49befdc94b840c9b7d493b4d138eafb2/71399332155.pdf
    • http://dok-vo.ru/userfiles/file/13401286015.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/7209cf1a473b92ab174540a2254603b2/38456857101.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=un+placard+french
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51c.bin
f00e9dbd26fae49ad8fcfbf04133d28c41d0e12f53e7ace4e50da4de3118aeec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 18960 bytes
font_01_sfnt_off00011504.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 16140 bytes
font_02_sfnt_off00012a80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 16792 bytes
font_03_sfnt_off00014297.bin
ebd63f6f0eb4f82cf0c90018f5f0fa3d81c4088f84521bcb3bf4fdf96b41b45c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14297 10244 bytes