Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c80c1b9f14be043…

MALICIOUS

PDF

94.9 KB Created: 2021-07-03 19:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8108e46200548044ff890c2808f0f718 SHA-1: 57a0a57bab8a48b0cfa0a909fdcc55ff69bf779b SHA-256: 7c80c1b9f14be04371734e9a190986f4bcbb18d8e34d5bc713d43e8aa483a06d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites, suggests the document is designed to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4a9543197c0984ebef77848b4cdd7a9a/fizodi.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/2j0fhl3ae9bdt9g1gj59a8un4b/kenonejuwulogowerarogolu.pdf
    • http://syuncyoku.jp/upload/file/ditivetitigabidunexe.pdf
    • http://texmet.pl/userimages/file/tivuxi.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/e3d7a996ad8f0357ff41e667bec073c7/40223191827.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a98b64a1c---40254200570.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/da75773c10f648d275cbf5e8189e9c1f/35344092206.pdf
    • http://delannahotel.com/user_img/file/kimojo.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1medkengkosapoph9dva4r0k2g/sikiwo.pdf
    • http://tlxzkj.com/uploads/file/240824172010.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/68433460594.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/63d63ab9cbabf43b9442582407115c53/wopiliv.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071e74e6a35d---3019777188.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab76b6448---zafunufatokudafelonefibo.pdf
    • https://commonwealthsportsawards.com/userfiles/file/50685206346.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ff89d193809963dca7de170b10d1616/87463358818.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ejote16vlv9vo7itnb5frgqbj3/47963926593.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/54k26hg7cepv34e2s5cdmh6qlt/reniketerixi.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4224e5ff07e9aed6c1c5eb7de457dad3/zuzajopewulewezaruzalire.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a7e650219a9eff324a09b69bd5b075c6/68419075038.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/cr0gcb47tc247fulb29dt9248q/2576152268.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/s5ad8si596uvc6lul4vi4r7bbm/67117676985.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cff92349edc---xolesujujigorijovimi.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160acee8389535---lodobuvivisu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=interview+questions+answers+tips
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f5e.bin
1a468ba3d8f029da778e3782aea646c5e333c4ff24f4e66d6d3cb11047bffbad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 17792 bytes
font_01_sfnt_off00013e0c.bin
3d7003c88fb83385a600f450a5df5f4d0cd0c92ebede273219f08b0b952500b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 10548 bytes
font_02_sfnt_off0001564e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1564E 16792 bytes