Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ff5667161ae76c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 19:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4f3831908cfefbe8fb43323c2d9c5d2 SHA-1: 3b74fb5cdd6d5013574415bdcd9047427932f8e4 SHA-256: e2ff5667161ae76c6c33003c5fbd1e456d66625836568a9ec5ab0ad9f645b284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=order+of+my+hero+academia+seasons+and+movies PDF link annotation
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/lelavadiwesetudesa.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/59600061041.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/zogifawegibeti.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/2028025758.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/verilexaxip.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/86890025828.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/wotulegesuripavej.pdfIn PDF document text
    • https://manenshop.com/upload/files/gobuvugiwawijigexejujugaw.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/51625305667.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/supiwesu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8e29ddb4b02c8360c478ce1accdb5377/gobozulu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9iudg9g5mironulaf9c907v3v0/balatofen.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090710471699.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/94775805423.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8a9a6e7d190a68c9af0248458decf38c/vowexasunijej.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109151949404554.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161389b7825dcc---7654802198.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/40527420775.pdfIn PDF document text
    • http://glttek.com/userfiles/file/rupuwelo.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/wozogulaxelaj.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/51727069057.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/42860625394.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/xavowutivenukimonilewiz.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_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 10800 bytes
SHA-256: 6a53c8f9ebb7cf902d60c3628de51dffbdbddf66f4f1e470c9cfda736e424d81
font_01_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 20788 bytes
SHA-256: 39733ecbf56aa3683fcf37c8274b8fcf01da8d74b60377d6d04ebc2da1ced846