Malicious PDF — malware analysis report

Static analysis result for SHA-256 0738f855d9f16758…

MALICIOUS

PDF

138.1 KB Created: 2021-07-06 17:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe6b50c5c28e0edbf5fa1e652c75e604 SHA-1: 5cd3ed9623342c19fda9b1c56622eae1d95e4d78 SHA-256: 0738f855d9f1675808055d07a8487ddd37f515e941429eec838fa86bafc1d9dd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://drafthe.ru/uplcv?utm_term=madison+ms+middle+school PDF link annotation
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6818e2476833585f24cf1ca5b490b9e9/30956366595.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c72ee267771920752cd9e7a82f441ec0/sakirip.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca448ec88---42084764512.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/81fsjjva9m925gln1lurjn1gd2/suwexib.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jjsjv4fk5063g32g1856bh0vqb/rodixanilufidarujogox.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b9493f8b8479c9a2317b35a5bb08f305/guledosamakedageroki.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722a9cb55d9---10658470033.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897dd96421f---xewopuzug.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/88306012657.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac7a3e837---40344345576.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/waladififorizuwukujali.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160765fd1b9c4a---bakixina.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/nisisenotumiso.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/646ejogjq7lf5v6iu2m2n2gvlq/84201497430.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/zevakilotetarukojosikibe.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/rokudenunamawakavoparu.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/56944349492.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vgtnp4srvoen3g4f94k2r06f94/26809260428.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3a0002a7515d19daee1d472623319282/lepolitako.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/95454587414.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a2077e32578dbaa40f6257176e1a1286/diwezisojozu.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/cf7rvk14i62khcn9ghe684qidq/fovilopedo.pdfIn PDF document text
    • http://erdbau-rauch.at/famonezubegarafidinuwux.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_off0001bc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC88 17880 bytes
SHA-256: 0739bd7c1df4495efb9a049539fa494e758f30b86fbe2563048368872d96f985
font_01_sfnt_off0001eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB66 10432 bytes
SHA-256: f06f91cdca4d6f9426bcf7d2705cc7a01b42b290fb48f6afcc1639e67e4a16a6
font_02_sfnt_off000202c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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