Malicious PDF — malware analysis report

Static analysis result for SHA-256 2203b2d9d708c27c…

MALICIOUS

PDF

94.5 KB Created: 2021-08-13 21:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b7a7bfdedf266d270f00b35030c7bcc SHA-1: 5ef98c6df25455270c19c693f9b7a80c2038a11b SHA-256: 2203b2d9d708c27c2baba141990c96cff55c765c4a9eed1b9a9c7cbf02b6c9ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://irlanc.ru/uplcv?utm_term=iit+jam+mathematics+syllabus+pdf+download PDF link annotation
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/ll31khearlftm9uhvvh83jl40s/popefug.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/32507ba2ee67391168441b6240701c28/44768070182.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/worugonupepijutudurira.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/68bsut9eatf18bp6ftl3efgf8s/dakorut.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/fazemududu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609182c774f79---68776990497.pdfIn PDF document text
    • http://cookbox.nl/app/webroot/files/userfiles/files/pubowib.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/82983349803.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/88292895581.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zavuj.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/19739988417.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/97861888059.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607819a6d01a9---9677602112.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607847c5af338---92897885200.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee5a4baa19---84810545073.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/mesonen.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/9664545540.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/13763033991.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wusigijugokoloniwu.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/37825722105.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160820fd07f91f---59958351894.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/82jo9ij970efc6jmc9cf0vf4p4/61930486813.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/76376843438.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c3713861b---74966998858.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_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 11308 bytes
SHA-256: 33c2e68fd981f7300804b038723f88507931b3478d692d618b5a93851750d94c
font_02_sfnt_off00013cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBF 18108 bytes
SHA-256: 3c41c91580eeefecc43d6c42a1a8faf4848b8be552e38f7433365d786641a38e

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