Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a721158c00e747…

MALICIOUS

PDF

90.9 KB Created: 2021-06-30 04:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06a8cf2d3efb4cbc45d317b67bf0dd8c SHA-1: dc5ffc48eded217c0558276e5634c6cb0377f20b SHA-256: 82a721158c00e747fd4ead7e2f147f15c09113473f82c7be1aa75bbd00bf746e
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on disposable or compromised hosting suggests an attempt to obscure the true destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/768ca8da73ba1421f69996c1351994c4/32939179695.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160869f21ba1ca---daruwibowiniwak.pdf
    • http://abpaluso.com/upload/file/xirozedudulotaw.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6fb8fkt8e8qi1o9jti11ltgob/80641421845.pdf
    • https://aulacvn.com/upload/fck/file/66812078732.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ra2f2j1k9qc6dqihnggqcktcjo/rinefebelanupuper.pdf
    • https://tbsva.org/Upload/files/20210629215407.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa2af37fb---pilixesupotopopivadat.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/kadisetiterilasubobiwapi.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cca8b785604---57953728977.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b29731154---74597910312.pdf
    • http://jyjwqj.com/uploadfile/file///2021060113295832.pdf
    • http://lucann.com/Upload/file/8729112690.pdf
    • https://activepymes.com/pub/file/43811896318.pdf
    • https://securitegenerale.tn/userfiles/file/javareguvexot.pdf
    • https://celebicatering.com/upload/ckfinder/files/jufodexaxoveb.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/u5fghpjafn821eo761qlmvjf4d/xadotelusodox.pdf
    • https://hssanesteban.cl/files/14176674697.pdf
    • http://ceskylakros.cz/userfiles/file/ranirexoraxajipekeli.pdf
    • http://beiwendq.com/userfiles/file/gevawilufizelofovod.pdf
    • http://beiwendq.com//data/attachment/file/49196675930.pdf
    • http://asea-admin.com/_userfiles/file/20210501035352.pdf
    • http://bumsnab.ru/uploads/files/zalegire.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=paragraphs+to+send+to+your+boyfriend+after+a+breakup
    • 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_off0000fefc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 16792 bytes
font_01_sfnt_off00011713.bin
eec34491f3d11e4afe78e6ddfbf85541b6b1c8dabc2d9c3ae9a361137d176c54
pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 11180 bytes
font_02_sfnt_off000130c6.bin
734dcd9fd3a7cb3b378827732224d06d9da469ba576c1de86d3646dfe888ec49
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 17416 bytes