Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d4dca20200b754…

MALICIOUS

PDF

90.1 KB Created: 2021-08-22 08:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2e8d7d78be95def4429e1f9df6c2869 SHA-1: 8beef817b3fea19020cef20728cb7299a32324ba SHA-256: a9d4dca20200b754153447dcbcf903fcbf9d04cc14f3e4a51622ee650b58e0ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The heuristics 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document contains a link farm pointing to compromised websites, likely to deceive users into downloading malicious content or providing sensitive information. No scripts were extracted, but the presence of numerous URLs and the nature of the heuristics strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://daaeportrett.no/upload/file/majot.pdf In PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e2993050ebd91aec9d30b69a8b15a8eb/58660486355.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/vulorovagujivo.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/sufowejegosuv.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609129ef6e9f7---842637304.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/54334181492.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/qc099l2sjv23rrv8g9cvmjfb0d/bobumakomowixaweriboz.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/n3p6t79h13unfct73p0lqn5n25/23470731129.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6cc85d9a2---79550241697.pdfIn PDF document text
    • http://industrialdevices.in/uploads/kobizasukoxapuzovubejareb.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/19462187106.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/fixozike.pdfIn PDF document text
    • https://atlantidegattico.it/file/90946918564.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c56fd5925---21816240384.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/peluxosixaxunorinubo.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/26753595478.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606e4a9821526---77762544328.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0c93e6deeef90f9e8dd69f50893ba032/76048811573.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/1898737480.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1628777372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=netty+in+action+bookPDF 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_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 17440 bytes
SHA-256: 812d2e1b9557d23d6ce9b7fc69525b502a9ec0c88f536c9f2da5c419bd87a3ce
font_01_sfnt_off00012c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C58 10232 bytes
SHA-256: 79bb7747864493817a65d776ea835ff83e71938b653783defe7d97df6cc0e73e
font_02_sfnt_off00014383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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