Malicious PDF — malware analysis report

Static analysis result for SHA-256 465e3ff812a3cbce…

MALICIOUS

PDF

104.6 KB Created: 2021-07-05 06:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1edafdab40ba780fb7ffe4415790f651 SHA-1: 650ef615e744c3eb0a31cee538b099eae3194e2f SHA-256: 465e3ff812a3cbcec5a97cb2aba2ed62554557e17e785c5ccfcee3b85f95d3b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO abuse. Although no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://medvor.ru/uplcv?utm_term=fire+emblem+gba+rom+hacks+for+android PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf22bf2085---18452907396.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/73556256474.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/kodurawowubuvewamegoju.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900f2b93a75---muruzibekogurav.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/julefarebeporagimosis.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/78166328032.pdfIn PDF document text
    • http://hydrem.ru/images/file/zekawewotox.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/16882039074.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/83547384418.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16e3d5a84d---rutuvinunodu.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/dudiraramozaneturadafu.pdfIn PDF document text
    • http://teraval.cz/res/file/simozokojeveluduli.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/urvj74g0pt6aifag97ps06grqv/sexosokosujija.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fcf0d72b611cdfaca63d9175bb7d5572/jabiduvela.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ko29a2v0e7l6up57aju4o6t68/33941210857.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/51838064874.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160836f093b73b---24554207520.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/tubenipolu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d5b23eed02d9e49fd30492d8688614bd/75647266606.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/12cd0f1c7cd84cf54aa89e6c2c915ccd/5559800721.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/k462k4uue970ge5vl6k28r6tnd/32544500981.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/68c887b80684fab07ea4165cec837e6b/jusipiluk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 18516 bytes
SHA-256: 6c66471d6acec27653edf1739f69c60c9beefacb083b5f7269f491e82f9375dd
font_01_sfnt_off00015a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A35 2004 bytes
SHA-256: 89cd01d6aaa529676cd8ce2c7b68a34e1a55fb5e8efdc7dc98a3bbd81b1f0407
font_02_sfnt_off00016352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B69 11032 bytes
SHA-256: a28e4a9bbddda2162d1f3aeb067269a9d83ef3ac370a2c29a8234577757a6587

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