Malicious PDF — malware analysis report

Static analysis result for SHA-256 0703acde201ea055…

MALICIOUS

PDF

91.4 KB Created: 2021-09-11 23:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 413407faec7600d46deaa0f5968075e3 SHA-1: 1b5e4e6c55dfa61052af1090b8117ea763e1ec27 SHA-256: 0703acde201ea055c9c511043b8feaa67a0e6452e3fdfb2751ac8c43b3e79ee3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ttmplus.com/userfiles/files/38075101616.pdf In PDF document text
    • http://gelikonline.ru/content/Files/tawexixanoxubivefagoba.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5c12d9b3---99966823479.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/12199141919.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/68396252921.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210905220140120.pdfIn PDF document text
    • https://thehouseproduction.net/file/96840678812.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/baxajuvotani.pdfIn PDF document text
    • https://parc-hotel.info/file/nelasazawivimerebelose.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/bokadapodamuwoz.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wunabar.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/rdeglrc0nqr9ilahfbt4bto4bv/84245907845.pdfIn PDF document text
    • http://ergakiland.ru/files/files/73566022240.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/95544531220.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/navudum.pdfIn PDF document text
    • https://maymac.info/userfiles/file/lazejafotukemi.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/semerisomabis.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/fikun.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/24725508796.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/19197879204.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/rarigezumotudukokapixab.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6942b8210---54580257261.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/vuxuzibosow.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090223133348.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/walegedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=oxygen+os+11+pricePDF 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_off000100a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A6 10536 bytes
SHA-256: af468b4c75e46845d109d59893ec76ea57ab89983ab7d68612f823e4bc6f834b
font_01_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 18460 bytes
SHA-256: 162c9eaf0eaa1f38d63eaeb9a8f545067a219d92a2c009ec9874d0ce9c0fe623
font_02_sfnt_off00014878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1