Malicious PDF — malware analysis report

Static analysis result for SHA-256 67703bfd3586e6b8…

MALICIOUS

PDF

79.9 KB Created: 2021-08-11 16:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78409bb4871d8b4d9d97ddfa47cc6e9c SHA-1: c96b23735b7daa6ed60a4eb64f17404abdd96be1 SHA-256: 67703bfd3586e6b8caad7f92043d37761162e34332f875ce6249c6f4fa9dfead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement or potentially disguise the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=exercices+types+et+formes+de+phrases+cm2+a+imprimer+gratuitement PDF link annotation
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839cf79b1c---21996219173.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c965218aba---2246473580.pdfIn PDF document text
    • http://faradbox.pl/files/file/ronukowimadezawinivu.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/nawapofafosudis.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111a04977ea8---53920631784.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0bf8f4025---kunuletemetesapipimitel.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9dumqjp2bdanbtsljo20os9c11/72877841006.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/91395028395.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/jitukijukoluruledukufezug.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/1271501349.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/80850261244.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/01b44255c3cc049f270db72753c60313/kavagalarota.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/wutomo.pdfIn PDF document text
    • http://groupkaishan.com/d/files/vakinivadutulezokexu.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/44340558329.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/97824793943.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a5e06478a---98663840307.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9ad6db32d---11338632335.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fupikajoxudelir.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/2ca794169adfa91e8a44fe93011a8f94/53711697844.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/90194110277.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/bedidogeliwefolomo.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_off0000d028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 11440 bytes
SHA-256: 2c2937cd95ec3303eec5d260880e8850a0056c83f81b693600d2df783e242919
font_01_sfnt_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 17888 bytes
SHA-256: a2e6c263e199d7c6a1d454bff6f674219e6d8e69ae260034be21f1936c0dd749
font_02_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.