Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e17420c3fab8fce…

MALICIOUS

PDF

95.3 KB Created: 2021-09-19 21:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0d8a5ee19e74f86d6ad8a95d5f20a20 SHA-1: 6011459a48bc6586aadcda2bbab756bb5463243d SHA-256: 7e17420c3fab8fcedea27f88e3a4402584d1c0726bcbb388e7f4815ca8a42a48
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://se-ty.ru/uploads/userfiles/file/60007301066.pdf In PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/daginigam.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e01e3c91---67635707880.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/10625927988.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210905_8D70E211AE353A8F.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/69952935290.pdfIn PDF document text
    • http://kotolantopeni.cz/file/vijitapoxufigebe.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210918210317_MjE3NTM0NDY5MDI=.pdfIn PDF document text
    • http://vladekoservis.ru/files/wukemififuxusaxarepi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d137544a27---86069066141.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/77f63a549a0620e206af5a00ffe12fab/zutufokalobibuda.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f376kqtrq9d1dbtu2vd75k2jh6/36662464012.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/mevajapefinoxor.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/rojodagofogafamap.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/17365528104.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/digutuxukuzul.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/fetajapewawego.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0c92337ffc5bc6714017876d83ef88fe/fibuwoniv.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/25273498596.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/64401461049.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4daf17f2b---15775141306.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/92290752648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=accounting+and+financial+management+notesPDF 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_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 16568 bytes
SHA-256: 984f42cfa5e12f93a91aa0bf13dfecf5b23ea48c1ddebd6231ba405a754481da
font_01_sfnt_off00013ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC4 10800 bytes
SHA-256: 954b53ad4de59d3ba769099cd7b6a2289e590b7c4cca25457d6fea7f4e3dc153
font_02_sfnt_off00015788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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