Malicious PDF — malware analysis report

Static analysis result for SHA-256 db70a35cf742d585…

MALICIOUS

PDF

114.2 KB Created: 2021-06-30 01:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1873d8fa74e6a42bd378e310c11ed6d9 SHA-1: 6b70aeb4fdbf50edae83e7e53a8d7dca9e498dc6 SHA-256: db70a35cf742d585a6304326464371948b4324d76a4c6f4ccec39351dfa3ed5e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://automsystem.com/UploadFile/file/20210611194150102.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6303d169---gagibodotix.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/vumajokipejarute.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836babbc538---pelamixomibafisivosuta.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/15168544956.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/defetanajitiwidebulaman.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/419daf3eb4f241e7a143c04cae175993/bozizunan.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/977fa42154944bcd76330da3dcffad07/5777042453.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083876d87424---13104706888.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0c712b7fe---56952340067.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/zodekukilux.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/55cd42a0c7d0ec40a9bd28b233ed4cce/nesubodedu.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/22379237015.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a603f06b893---fetonowuriworuva.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gixemojonoduse.pdfIn PDF document text
    • http://adveotec.com/img/file/zexumamekudi.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/843822437.pdfIn PDF document text
    • http://0930actress.com/files/files/79295711577.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/fenarobopevigewejus.pdfIn PDF document text
    • http://ruresept.ru/files/file/85507818189.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607286b8976dc---semotumajofezexumiwisona.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zoronudexagetiraju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+does+el+mundo+mean+in+spanishPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C14 17860 bytes
SHA-256: 28d81ae80956269955f4a02fb2d7ee10a60252ba7cfbf1c16b6809c04f76a30f
font_01_sfnt_off000189da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1F1 10652 bytes
SHA-256: ca9b66cd0fbcb58193f83bfd69bfcd47066481cbf25763df7ed2c7efdb7469c6

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