Malicious PDF — malware analysis report

Static analysis result for SHA-256 3290c08ae3cbb515…

MALICIOUS

PDF

87.5 KB Created: 2021-09-08 07:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61709aabadb4cee97f3348a8c0a748ac SHA-1: 464aa46800c4f47e3e2bb2df882f3925db1b1f76 SHA-256: 3290c08ae3cbb51586c0b445f82a593e98f0c74f3ec1b1cefb61f3505915e42b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=echo+chainsaw+manual PDF link annotation
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ea21138a---gofikiwam.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f8ebce9b---kiwiforewujifelubonob.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b47bc052479---25034499341.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16076025ee7bad---32406822624.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zifinixo.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850f7abdde---71704357869.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/74903036715.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/buporav.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511182215.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b6a17c843460f60763c021420b3905f0/sinigagowejinexil.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979c9daecf8---xamenutilafedorisijosito.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210722_024345.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/mojexizudixepoderapefajig.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/neguxaxolowimupuzijezo.pdfIn PDF document text
    • https://fobh.net/userfiles/files/bipivulokuxiwi.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/32796001584.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099eefe3f92c---wuxexefibulifujeli.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/begasimamivonomaroto.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/9322103635.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/39450f45c0a11fc648424a68e6e97bb4/66475886477.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/233d9ba1261ec90fd789f8e2ca205914/13519071220.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/doveru.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/81134639909.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/zoporelotuwafovurofot.pdfIn 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_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 10336 bytes
SHA-256: e67b0bdd69f7d8e7584418650b5c41d4da054b9e7a0b4b644c834dc5503c2235
font_01_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 19176 bytes
SHA-256: 30c7d88df90fc889bcb3cd98475a03079763b59d683b84aff282eb1e7c04b24d

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