Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd41e3bb2956285…

MALICIOUS

PDF

98.9 KB Created: 2021-07-31 08:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35e3dea43d7c2adc92ecb0026b242325 SHA-1: 7eb5ae5bcca5c0ad1aae51b2660baf15865af15b SHA-256: ddd41e3bb2956285b2cd02ba4083817089296279110b32c873ce824252dd562e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/bc90870a336712a2642871b26ee7e283/81698318593.pdf In PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/51268796886.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/9858840928.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/6008271312.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/48d6dd11a235637525d537602fc1125b/1334090998.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/fbc181802c1aa8d1888f6e42d6e7e98a/bojuv.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/47267415609.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/94732197264.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/siwavozanokisitu.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/tatagobugarogukuwivorisa.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/73954f25bb5b4522cc6de8b07e8a7278/masolato.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2dfed72998966590a2e67aec82866e47/felewobematuwupus.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/85961759301.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062611422373499.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/cd1c9471adad4f4afc0d65e8fe1ae60d/digibosoxuvil.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/57324678703.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098afbdeaaa2---38367669281.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hrdd64iporp9mhqmb8vtu46q1e/36503920751.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qeni94fcfvrdv63a4u89vmhhq6/49607532393.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a51fa71d3---41967660770.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e09fb2ed51d5991c18ba8988c0af6300/75428150526.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nuxigimigidipejixiris.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ac9ce932---xozogivoluwofozonog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dls+2020+liverpool+profile.dat+downloadPDF 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_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 18088 bytes
SHA-256: 07321861eae3947f6cd1a2077742d0014057bf0b221556486c1de786de1eded9
font_01_sfnt_off00014b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001634c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1634C 10952 bytes
SHA-256: ccf3618f7f8399ec3963af7e47d69a547ef76dd242ef838d68665dbb9288cf62