Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4168c582bfdd94…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 07:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 772abaca58cc0908db78d45376be4e7d SHA-1: 3120f34af6a149a0ab547c2a402af94c89bb78dd SHA-256: 8d4168c582bfdd94386153ea1a8b15f01989d492185fb83d58b9a642774198c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm structure and heuristic firings suggest a phishing or redirection attack.

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://zovsh.com/Uploadfiles/files/baxenarofimuxirof.pdf In PDF document text
    • http://consulcongress.it/uploads/assets/file/40917065922.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a6a10bb3223ae566989e2f7dc9bed01f/5409450179.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/17516838683.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210617_020631.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/lusijapakidoxomijoteze.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/dc9054fcccb5d2b5c7645777bc58e214/jowajanaw.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/38998820962.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/ae389c4287c06e465808742ec2ab1689/zirumijumelonutak.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/vovufilaxag.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/wagoresovaxilawenuvi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f0fc07c009b5c742072ed25b31ae99f4/1669588118.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/lurisimokidepo.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/gipur.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/56548855225.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/34398442870.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/53011639035.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c9f6b225d---wivinafenavuzamusolanave.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ac19af554---69157152729.pdfIn PDF document text
    • http://alkanboya.com/files/file///70809802705.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/pemosisisub.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/sewatukonejamur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=david+copperfield+chapter+1+questions+and+answers+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 11168 bytes
SHA-256: 2296c4600e10ac875ea92ade41f948a4687c181bab01f4a7ae0b22c29d3791d3
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 17728 bytes
SHA-256: 12b9b33d0f544c255c15e147ae115cd9e873396079b2db6bd0ee58d94136b541
font_02_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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