Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9e1b92fdfd9da7…

MALICIOUS

PDF

82.8 KB Created: 2021-08-23 17:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c29a1951f75e20ef24caa2d4b94ea6b5 SHA-1: fdb0735d9f2b44b7a0cdb89cda1944406b8a787a SHA-256: bb9e1b92fdfd9da764c70dee0015ad3a94c325d4e0680849d19573ce0d5e03ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and other domains, likely intended to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c4d25fe5c87efe20db5300f9b1daa0c3/bibunoradig.pdf In PDF document text
    • http://ashokarefrigeration.com/userfiles/file/42003237463.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/41942998993.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/3252862173.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/50872073831.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0972d98bd7---67548968091.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/madozinegoxafosolikik.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cc9e7b4fc---fiburatesegukukajaj.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455128f502---89181948504.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xojopa.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/19315109272.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/ridajotoledufetavawepo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e21c835b38d1a0dfed8f83cd0d032156/66971668286.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/31059432889.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/wimuraduxufawozovafubo.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/10732608983.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d9c976771b5c4572843a888f25a3f373/44205404004.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/zedugofosurirovuso.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cc7b0bcc46513a59a49f0915715a1b90/65529051100.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/fazakademu.pdfIn PDF document text
    • https://fultoys.com/userfiles/fubipigimaletolosagi.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/wepeve.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/grh6j6ink6ch3pibentcjpvh29/rolizakibamuzago.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0942f3b5f3---fololojediwuledumir.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/29569791623.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609083d3d8535---pufowunasitevim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=why+does+spleen+get+enlargedPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 16160 bytes
SHA-256: a68304961c568c34a8ffd49076e8f6c56375e8d9887a15826951d1152d5dceeb
font_01_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 10688 bytes
SHA-256: 3313da118d56b8c13073cb747d64044c7a44d7614ac7e42af1588d97f210e29b
font_02_sfnt_off00012514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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