Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3f89d3edaf492b…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 16:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db2651126d8aa7f76672e73d9850a1f2 SHA-1: c6d43304453488527cd3d277d706d11dfeaf9084 SHA-256: fc3f89d3edaf492b114afd985feb17a8cda3ed4cfaeec81326de257882fe76cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised websites, likely serving as a distribution point for further malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=mcgraw+hill+algebra+1+teacher+edition+pdf PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91bbd429f1---nafin.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/kufakakif.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/toxugovunugedasije.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4qli0pglovto0fbqraqvl7g541/86280557445.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9c3b6997---93495260862.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/71883334089.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee103f45c---92070147893.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/61152297100.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gitoreb.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/vogimidilagiberekimoz.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45480a73f---vakofideloxoxofovu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/vevenowoxelej.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/14101201879.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd5d3d64a---87629806558.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/99617404824.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/95455829752.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de1a9213016---67421337150.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/31730542181.pdfIn PDF document text
    • http://decorstore.eu/upload/file/57945211307.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/jeloduru.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec4f91afd---kitirenitus.pdfIn PDF document text
    • http://888chji.com/userfiles/files/purelux.pdfIn PDF document text
    • https://paperland.bg/uploads/file/4126750873.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/64214740909.pdfIn PDF document text
    • https://lasanisports.com/files/sifiwuful.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_off0000baa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 11004 bytes
SHA-256: 594ad244bca9262ef9a8b563f0d08f67fcfcfc529b8ae2af8cdfbd1b37745c3c
font_02_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 17308 bytes
SHA-256: 4b78af2f53f5d9c8e5fc1b5ec5177ec3ae7ce4643c3ac9a32b36b02c788adba3

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