Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d75c854813ea82…

MALICIOUS

PDF

90.2 KB Created: 2021-08-05 16:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00ea00f12dcdc73f5929be69d0fe9894 SHA-1: 8a405254d945ed466520aa7c605cf2672b69de45 SHA-256: e5d75c854813ea8262f5808b6a8af2a1508c3c6318fc2064f9c8fe508eb0f701
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b83da790e---85185393655.pdf In PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/ritevoderibajepisisagof.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/tixotenevasomasobojexaved.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/p77g1coskduqbs1qkvqledrspo/nolijalisorinojawe.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/51832976545.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/30064224808.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8rg5hqamn1dvk3vgn031522l63/4821026724.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ce0d90b4dd4e5b94c29293b090982976/vajogesesi.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/67900550400.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/45291971788.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a8ea9e3179fbe314ee8ed86a247be422/56545190270.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f8cf5871463---4119563582.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/12758798154.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/disegegidegipovupebedamox.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3907cb7f---mololu.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/felukaxofu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078e871e8179---nukivotabugitarodoge.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/viwibirugoma.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/firadaxizu.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7f3b19d40c57fdb88359cd32638cef7e/72148690906.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/94431324023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=acordes+de+guitarra+musica+cristiana+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 17928 bytes
SHA-256: 7dd4c9168dce7ebf82b17f77dcb324f22a344b33501a15370945ed510b5713aa
font_01_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DD 11000 bytes
SHA-256: 168fc49a3181e6eb808705d318064860b12537dc02cd0b34855952e5dfa5cedb

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