Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0c1de8bf70886a…

MALICIOUS

PDF

72.6 KB Created: 2021-10-08 22:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2d976e0c9ae4b58eb0c8a63eab2205d0 SHA-1: 14a587a41724b84ce364c6661e45c6675d2dc5e0 SHA-256: ad0c1de8bf70886a749b878cb122a68d292760f6591870019ff4ea02d6e332c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://drafthe.ru/uplcv?utm_term=when+your+body+jumps+before+falling+asleep PDF link annotation
    • https://kluchar.net/klucharnet/images/file/82628148486.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/25516505614.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tigezowexam.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/pigutozojipakalagag.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/61116119528.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/kafimogebotaxilazek.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/timeraranibiwodu.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/xupubinebulorajedo.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/vawiwijazow.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/mibewe.pdfIn PDF document text
    • http://scro.ru/pic/file/xejoguxaxumo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/959eb2dd48983f9e68ed16e2ffff789f/pipunonug.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/16762262088.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/takerosu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bf354d0889ac895610d9ce648dccd1af/25641587042.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/1vv5nvegu733lgok6davjmjk52/fitogemuxugad.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161595c475facd---52572168336.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/finotelazatavukajudoxu.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/23126766930.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/90654574081.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/79262259796.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/xeren.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/75169871171.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_off0000b9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E9 16132 bytes
SHA-256: 49c34ef955f52562aeda45f7ee41789b06ccf20f1230e5ca2b4cd586c02abae3
font_01_sfnt_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 11324 bytes
SHA-256: 9878ba51989e8ca438aec6dea24af42b32a70dc3dc92a34e6fd2ad6fa8068af8
font_02_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1