Malicious PDF — malware analysis report

Static analysis result for SHA-256 204f64f2e1755746…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 00:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c804f3db451aee91851a1a8bcb58be55 SHA-1: 9b1f1537ebb6add2188826072ae3101057272c02 SHA-256: 204f64f2e17557466b6f29171cebb9832d64a4eaa0bc4dfc2c3b2476350735ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

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://krisoc.ru/uplcv?utm_term=mehndi+design+back+and+front PDF link annotation
    • https://argumentua.com/i/file/towejudokatozezigel.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/95917599631.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/hfrgf1984m03jfcrs063edklej/zutipowakofoxotinikebidub.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/vegozigaz.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608c948c6cf8d---waxiwinufu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e9be3a487399bb78bd9c3a5e564e11b3/11882544652.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/11692965206.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/145649c1a3da13892cdd284181c7598c/6159077398.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/24792044668.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f7d43974cccfd570639d79a7ade25b20/79876439001.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608997549df06---foturegilow.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9ad0c7ba23e0e8b609a7604b32c50ff5/dusipirilikuresabikovuva.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/072cc9b75ed5238d0be09aa34f4bdd5f/kapuwup.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/62278432878.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/vijiribivolovud.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xelinifix.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/bujofoviravikojoputexe.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/19859878229.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/943a86fd8a6c2730c427c2e0b07b9f41/zavupesax.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/84662575796.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/10362250579.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb26d4234b---31093070344.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/23546969941.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/wamutiroxo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081843a9fba6---xaxukuxusosavirupiwe.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_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 16696 bytes
SHA-256: 166bc5dd74af12dd6cddfe6a4d496ffcb004456eb1b6ff1285e17fdaab4054d7
font_02_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 10936 bytes
SHA-256: 35f8f7209c41a8c2ae47e765f847709cfd267e5ca299235ffa32a9d535a23198

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