Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3d2befec71b9f1…

MALICIOUS

PDF

80.4 KB Created: 2021-07-05 14:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8b95cdf90d6a954014ee593bb465d660 SHA-1: 6f1f285264d5071b9c27d073c699b4c2a7606ff2 SHA-256: 3d3d2befec71b9f127afcaf242b377550790eb5dd46aa9b7834b290e1360577b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=specific+density+definition PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ccec6bbd4df53847dac80f330d723fe1/98489581224.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/51bdaa54be114248640709e5aea417eb/koremeja.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/39ace0caa439cb01fda0e8c2f4e1f107/16107817997.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/02a3c02db6c37808032d5ae7500f4340/99215992948.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/furunutoz.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/98427690462.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c226dcb2e011c9cf3c841364df9a8be2/bebof.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d1aef912---23338066925.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/weburomolotivojojexorej.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4vgqkg6dv5dapiqe392b9941qm/96126396946.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9e0b4fd9c9739f29a5446eaac804f176/fiwubigex.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/150040229.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e024ba3d3ec36c12300c8c8ef7e392a2/5053251747.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/majoz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b451b0ead07---4737511615.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/traudle4uh0a1ic57t0ge31f00/maxegotafavi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4bdad6b0b94a47545d48dbd9f5e2b666/pakugixubodebi.pdfIn PDF document text
    • https://bio86.net/fichiers/zijevodoridevego.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798ed6d8f7b---ronul.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bbf1197cfdc69146c25ca236da967570/14088361113.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/587e2d4f0f8711668e3d2d3ab3770fe2/65592226299.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/254e76e5efe244a7119bf444173aa2ab/rozipiboxiwavurukizi.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_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 10496 bytes
SHA-256: f9742836fa3625849fc27df8ffa3dcd3d9e627071769ebf74d47eb9f178a8c7a
font_02_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 17120 bytes
SHA-256: 0777290ebf681fa710785556b1c65a794251b1bbff981a27889cdfe09bc1370d

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