Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a29c5718af3a3b…

MALICIOUS

PDF

82.2 KB Created: 2021-06-16 01:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00cfa564624189f9777a8d36f66eb78e SHA-1: 8e7eced15ff5b97e8c68e494a92d673b7caf4a8a SHA-256: b7a29c5718af3a3b029b23e284f510a700935d643acddc41b749229ae6cf4627
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=fire+mage+pre+raid+bis+shadowlands
    • https://accesoriosalmayor.com/images/userfiles/file/setabebolofivepumav.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae73b3eab40---wurekivevadagesusin.pdf
    • http://didocrosby.com/imagenes/file/tozogeseketanufugoxan.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6615993179---5552067934.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6c3phbcjur1vg7q73kikupp673/25738700358.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/229c6348a0ccd7eb65e25d26d7b4e42c/37655893154.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/0c426dbf1637a9012dd590370927591e/dedovulazided.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8527231da---roxinevo.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/60052508482.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a0a0446f3ecbfe59cc4bbd6175b9bfcf/35299849998.pdf
    • http://flambotour.it/themes/userfiles//files/semaforazibevanezanupewa.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/83jm5i54ajnd88n8hn8sv70uf6/66499936402.pdf
    • http://bukhatirhomes.com/userfiles/file/laxiref.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7lf2jn7hu64v8gotg69lc9hb97/luxawasazijeso.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8950e37fc---kagemabakulisuvalitajas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000febc.bin
045b5f6c4b83b11ce78d10407e578e98826d0363c1b101d226cb25c8e624197b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 5560 bytes
font_01_sfnt_off00011187.bin
f400d3f6969f875ff8fe82be20e37e1eb0e396bcc55da08c5da0ce70eeb53dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 12080 bytes

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