Malicious PDF — malware analysis report

Static analysis result for SHA-256 6985926f224de580…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 12:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a95c913002600fd5e7eed719a5c92455 SHA-1: 34ceac134dea865f81be72c645baf9c91242569c SHA-256: 6985926f224de580ce45cb597f668299ec1120b513c77e63cd32f7b272ccb9d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=hearts+of+iron+3+manual+pdf+download PDF link annotation
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b38a9c5d66c3f1ca8825331486940585/13765223836.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609243a98fe19---79326163553.pdfIn PDF document text
    • https://paperland.bg/uploads/file/38281704351.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c91616d5b59---58262698380.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1afv1vdethssrrmskj6tjt3hkr/zupolusamosej.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/47027059340.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210810_050758.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/spjthujekblmm3tir5qm5dknnj/nofatod.pdfIn PDF document text
    • http://altinay-law.com/images/file/javikipamiwapis.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/xopote.pdfIn PDF document text
    • http://954move.com/clients/4890/File/60672886933.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16099f1c3edc85---gozokozononogifis.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9cf50797a---pexosojuzavesaliwipe.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160792e6a5b5ef---77674792433.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/76825234306.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/46142099045.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/scv4tfno0b6rcp230kq70gd4u2/xatolig.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/81448590793.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5c2a71309b87e5f11b9aa0c4d31e3c33/bomik.pdfIn PDF document text
    • https://ebooksweb.net/files/file/mezorefanuxovezaxu.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/bafaxava.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/57994225661.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/26712544743.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/56907715930.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160787994cd8b0---41078439362.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 11008 bytes
SHA-256: 9f17cddbb7d8debb4f8ee644780f9c7fe1ce2cb1394422554a52aa8e37cc2e8c
font_01_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 17804 bytes
SHA-256: f3a1ac889a8a1bef39f3a918d977ef48ab4b23e05306cb59cc57aadd99a28d50
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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