Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8cc666535f9c04…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 22:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c020dded52fe85fafaa7eaeb2fd32c44 SHA-1: 19a876a53eb3ec5793d0b7315507954af287ab69 SHA-256: db8cc666535f9c046c3a6a5f8f13a5e65f3594c85899efaaf27832111f360d09
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised websites or disposable hosting, indicating a likely attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=i+restart+my+phone PDF link annotation
    • http://osoboebludo.com/ckfinder/userfiles/files/nakobapojiwudezapiwono.pdfIn PDF document text
    • http://az-volnycas.cz/volnycas/fckphotos/file/fanegurebibavevigur.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/92911098340.pdfIn PDF document text
    • http://bienbao.org/uploads/files/86096434007.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7e66c84a100aefa59f8a2d1486b52b2e/xuvubexogozutimadamilas.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/kixubabozalan.pdfIn PDF document text
    • http://xsteelstock.com/d/files/37396724156.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109121820026291.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/b1n9vq0g4066s0vt8tj93g0i7u/57319607536.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/zazixateketogujogi.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/93812234347.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/45132895095.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/24b8e8afe3be910756658f608b98870d/jezenun.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd532c4714---80418190911.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/wevarega.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/kijomevip.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/41964654013.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/bofijesajarizikiverubi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/f05hh58h9lcfpo7cc2mnfu6d90/40462928228.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161417a2cedc40---zikurun.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/rufalejisidivudaretotus.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/kimororejozinurenikiponu.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/6564540973.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161464d2ada1a8---93835568389.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_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 17572 bytes
SHA-256: dd60820f0f8b546a7d3144e15fc459635534ab58e465268d85b2a406ac3e04c7
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 10444 bytes
SHA-256: 7462960fc6e51a57b5dd17f39d485906812d4a90503988a0091002e6cabaae36
font_02_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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