Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e229b13b406ffe…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 01:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e6c0e7edf26d285b786f105b0a948b7 SHA-1: a0bfe70bde7ac822376918915b1764eace73fdcf SHA-256: f7e229b13b406ffe6e84bca7b11815e46683f4b84b3f1c8d68ed1c9454dda356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of UTM parameters in URLs suggests an attempt to track user engagement, common in phishing or malware distribution campaigns.

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://nomylo.ru/uplcv?utm_term=ar+vip+apk PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a2bba3df---kagajuta.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ed6b08e3---wifusomodetaziripisubilo.pdfIn PDF document text
    • http://ashioke.com/images/library/File/vevinivukurazidesok.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zotipasenibo.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/39421920796.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/55157044737.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/78225996571.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e7006f412a00287598b5d19285d59337/rajanudugexexefid.pdfIn PDF document text
    • http://chinalabware.ru/d/files/xupanaxonedezewevetote.pdfIn PDF document text
    • https://go2germany.ru/files/file/wevuj.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/zijetorofuwejadomezolu.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/kigapidadasasu.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/jizifovuku.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e026cb6a852f82388b87ff85577d10bf/rajizowigefi.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210915_225709_135.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5feddc836---pimuwesowowatopobaravawis.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/19394266530.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e357a357---kikamadugifu.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/nuredasepumobuxeve.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/93776225147.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/nirivotogamuzarefufaxew.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/gobarebuwazokazo.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/42814292313.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_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 20672 bytes
SHA-256: 185fb9fdd69d8a1defd431cda8fa2941456de4281a0a3445693fcd4b3a317898
font_01_sfnt_off00011743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 9716 bytes
SHA-256: 73d49457b18292e9e6732d9d1788b6f602b5cb1e2b6108284bc99230422fc5e1
font_02_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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