Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d81d713e5cfb11…

MALICIOUS

PDF

94.9 KB Created: 2021-07-02 14:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 36e5b8b2d39e0ee5d86f82f68b26e00c SHA-1: 318753ba293c12710fe7b112133d79cc5fb85b26 SHA-256: 83d81d713e5cfb117fed7615f15486567d7baa647efae431d0f5d336436bd61f
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to leverage compromised infrastructure for distribution.

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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/nqrc4l1jmvci5rjrrl7rr01ns5/nitat.pdf In PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/gadubokavo.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/gesijimune.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/22103058763.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bfb322aed615e5ab401038482d74a688/larotoxibokuxa.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/zulixex.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1decba5d13c49eeaf40308daffacbb5e/61274414520.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6c455efa6b8a0b19e30cd571dd4def22/34254159472.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ceda365d3fe7d02e4457532500982291/99998278730.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25561f6e96a713403725f75b83583518/46383548598.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b5476dce---69302178899.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/23992696943.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/34962908193.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/67256175252.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/ragivukisesevonigugorum.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/romovepi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c49b5e4f4b---fifet.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/falubulaxotafovazu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/lokoxumajizogopo.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/t3ik63lfvhv4kemt2nofsiqj34/78331491499.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc83ca7335---wuperotewemifubixigujot.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082108f7ea2d---12728764479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=different+theories+and+models+of+organizational+behaviorPDF 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

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_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 11068 bytes
SHA-256: 79272cb07ec286be4996ac7f40620fd7b197e1e8500a89add2c8eac4701651a4
font_01_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 16480 bytes
SHA-256: f216108692251707e7f08dfc6f5ede20b577069f2de8fecdaae33fde35adc241
font_02_sfnt_off000155fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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