Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3b44d5a21da757…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 19:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c4dcbe01c49feb2bd7c78dda4a35908 SHA-1: 04f8ff7775802e0cb90d9e50c84aa7a49b2a1de4 SHA-256: 1f3b44d5a21da7579b0fa30dd4b1c413fb51d66f681597b3d63fb9ab5b68c84d
156 Risk Score

Malware Insights

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

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 compromised CMS uploads and disposable hosting sites, likely to distribute further malware. The presence of numerous unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://baschin-heizung.com/meineBilderAlbertGrundschule/file/38701077375.pdf In PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/jedukovaluwitebitokol.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nowajodubavaxexifotapemug.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/40422977751.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/woruso.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/gidewomizovowu.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/depogotelewusubawufesirir.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/rudipulepezabe.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/wipanowaw.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/59627619632.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lefezilolebidutimudodutu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd179011e03---liratezewutaxesav.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/batilejopuwijebasavuru.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098d1b5e32ee---kimib.pdfIn PDF document text
    • http://ore-processing.ru/d/files/gemorawiponegizek.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a8b1aa634---donojawofukef.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/23561126180.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075359bd6757---vewoxo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077e50b4d277---gopulo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3vsl18c8tt929dvokb2ia17q57/16249975384.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115d5e3811c9---78098991955.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/08ffb8fac6ce9d2142a3c67d9c774a5c/61909603615.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/86975993002.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/11aeec7cd5a9c6de3126fe7855162af3/kofinunatixomif.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/xolujefepefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=duden+grammatik+pdf+chomikujPDF 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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 11176 bytes
SHA-256: a99e6a19ea49c5012c06817f0880f94b7f3e9abb974ef8ebf8f213c5c48107fa
font_02_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 19172 bytes
SHA-256: f8b4a16293fe8a0944eb00e2b62ba92aa71db43ca07dda6d374920e3d95dbac3