Malicious PDF — malware analysis report

Static analysis result for SHA-256 7594d0b566ee944a…

MALICIOUS

PDF

83.6 KB Created: 2021-08-25 16:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0e4b60cd313b50af4e8e2d745be9d57a SHA-1: 2f73164005e69600788ba004f14387859ad4bb1b SHA-256: 7594d0b566ee944a011b09a6a752595f2a5271038f6943a9d8ff1c2b78b8bf4d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. Several of these links point to compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=feels+like+rug+burn+on+knee+but+nothing+there PDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f03e4948e---73567622017.pdfIn PDF document text
    • https://tdfstore.it/file/5082767882.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/vibirikufoxegetixujuruzot.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/tejezomanage.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/jasev.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/63923476677.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/3540775139.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b43e3b74---53769118368.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/72892843357.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80b7d46c6---ruferelibodomarodogirili.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/17549878462.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba72c26c1---27646385243.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/diwuku.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69576d0e0---60671961518.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/69186899004.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/61827929793.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/22673622056.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/gtvg7r1k5q2h4ura58a9pr16uj/relugetamupofakerotipep.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e41e77983a9---84480940740.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e10db0ac557---rizikenekakatilaxav.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/6lo66s708nbu1dhku32e519jpt/lusenisakidow.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7935da4cab---jufojojemikuvusigonefaro.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/labowosevupobinofagiko.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 10536 bytes
SHA-256: 420410fdabbff8fde8744e0b97e0a7ca0cba5dab0e994fd15c09feb3bef04772
font_01_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 16788 bytes
SHA-256: c4f07ff1c17027b302df40210ee85778a225a9abbce5c237868ad177ddfb39dd
font_02_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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