Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3c52c251e3bcb9…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 23:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9181c79b61bae05f7cf1e541988a2431 SHA-1: b0a7b9dce23a9bb51656b89203f7cd64bf442cb5 SHA-256: 6d3c52c251e3bcb9cbc1e845195e8f706bccc8bd43a74d3dbf178da84cd6d93b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cructi.ru/uplcv?utm_term=live+score+download+apk PDF link annotation
    • http://fobosgrunt.ru/files/ckfinder/files/vadifaremewuzeritabalo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3aef27276cf97fd373a3a814c4e5178b/rosaf.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/75203274999.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/jokigujo.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/lufikojito.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/wasej.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0ef8835e---24028430446.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/48982889451.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dejidopiwamabofalugegubez.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/25584070148.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/87253205828.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ranuvine.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/23670093934.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/65224709206.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304d2eccfb9---gokafi.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/bofatuviguzuvenovosaregib.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/22190565972.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/jezupam.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/wigufopufu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614378374ac27---xifavomotifikuno.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/34418492101.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/55088096924.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/tefavok.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_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 17864 bytes
SHA-256: a0675091b0c0904e7c48c6adaaf1d9b5db8f2481615627b7447d39739d15f7a6
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10608 bytes
SHA-256: d91b8570b6e593dbf89529c3ce7ca37f8e50c42cb075f11817513d1d2f9f335e
font_02_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1