Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ed8dd3d3c1c608…

MALICIOUS

PDF

100.9 KB Created: 2021-06-29 02:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeba28121e645f18e92485dae29a426a SHA-1: b4824910ca70909a01d03e8c5caf00244964158c SHA-256: 70ed8dd3d3c1c608417e9fbb714ff0db02758a3738170cf105355fbec590efba
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to distribute further malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://ccskin.com/geektic/files/15830872659.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f7459c1a6f2b00dc07c6185856f88c6f/kegatixina.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/j97hjisd04fdg4qlfdgjnstli9/3174523257.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/p0ffkpirt10kidljslihalhoe4/puwejidunedasunumofu.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6cb31102---supamenaposoputozapir.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cf5ebc787---palijepofi.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/zevujaluru.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1214314c08---28504999652.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/54439524117.pdf
    • http://wooshin.kr/uploaded/file/191591862060bf8b0e2254b.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/01ecc3226c67805a5536ad4492c978a4/41506108373.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/sewifevenebi.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/dikuzogop.pdf
    • https://acrgroup.nl/userfiles/file/sadozaruwak.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d64809f20240e3527fbfc4e3c717ec08/24486547494.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c3d0e287---80595477379.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/95961603809.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf66d3a164---rezazoridasitelimori.pdf
    • http://abimobiliare.pl/pliki/File/20558748187.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e562c128ccffae9a1f0008f9716e9810/mademuviko.pdf
    • https://supermagnum-bg.com/userfiles/file/12387606480.pdf
    • http://kapelski.pl/userfiles/file/85697144862.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8cbc09334---jemovuvezisoluni.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=interfaith+marriage+in+christianity
    • 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_off00012852.bin
663ee5888d10886d0dca6d7f217464e656d47d08266ec10129808828df092860
pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 10684 bytes
font_01_sfnt_off000140a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140A9 16792 bytes
font_02_sfnt_off000158bb.bin
0698241ba3f21fde8d106a3751e5b8682a7424df8678d275cd9c9191a1c32382
pdf-font-stream PDF embedded font (sfnt) at offset 0x158BB 17680 bytes