Malicious PDF — malware analysis report

Static analysis result for SHA-256 b893177f70979e0e…

MALICIOUS

PDF

67.0 KB Created: 2021-09-29 02:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40d5b27809d8bfe1c2a670db427b73c5 SHA-1: 5ef3f155537006b29e052a67d9cb2f4c823d0ec9 SHA-256: b893177f70979e0ef9bae1cb3fdc20f6bd8824dd0da78227174d1d5c739f51f1
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites. The presence of a link farm on disposable hosting suggests an attempt to obscure the true destination or purpose of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161429509470ac---88206778839.pdf In PDF document text
    • http://4bx.pl/public/file/nisulokepivipatamobisug.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/35403521774.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210924_044738.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/defip.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/12236368446.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911060109.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/geloguteze.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141840858868---42378025945.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/12952465803.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/lobaririgajij.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/rufixanabijelorole.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/16198064527.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/tavejupodarovu.pdfIn PDF document text
    • http://poorclarescork.ie/images/62697609763.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/tofisosanusasosowad.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/ginunidujolomaki.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/68490739197.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/dofox.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfcb27b60b---sifubukamutudolovalel.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/weratelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=publisher+para+androidPDF 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_off0000ab49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB49 14292 bytes
SHA-256: 518be065633ef2c2a043b9d602605db75991ae73969388c03f57fc9295bca8d6
font_01_sfnt_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 10632 bytes
SHA-256: e7cea38d96a5b8d444dc8119d5cafc3530b204523ede1bad2bcf83637594efa9