Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d709e6060b6d7a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-11 05:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 297042f0dc34ee15327cfe8d33e056cc SHA-1: 8f4b99263833271a88abad1d1389c2cfe6eedfb9 SHA-256: c7d709e6060b6d7a7e3f333448dcb0f2ba63c6613e3c9a7b5b665429bb3b272e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using such documents for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to deliver further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=juggernaut+dota+2+skins PDF link annotation
    • https://angkorphotographyguide.com/userfiles/file/98686314927.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/tinobevizojofo.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/05/file/20210905_185857_111.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jopuleralivigufosabow.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/simiwavurimovimibodu.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zefotex.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/desoketunepubodul.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/babuwimaratukof.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/61029075158.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/makoxuxerigobofukotakijak.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/86c3df593c8616d996cb5362811fed15/nufenukexusibusulijelusem.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/fisuvofepanorebibezugema.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/batufuwasatov.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/67064335851.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/24836685002.pdfIn PDF document text
    • https://gencatakan.com/upload/file/manuxarojujisutusizobef.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136383fe1f9b---gasumezulovoriwukuserip.pdfIn PDF document text
    • http://totoumi.jp/upload/file/61615506247.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/64997982181.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/xukuxesubu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613950b1f22a9---19653728657.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/11878220857.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zezasatewivajejapuvera.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/bilebujujevexadutu.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_off0000c38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38B 18724 bytes
SHA-256: 613bc01d90a40ed857c6007bffb99abe29449936ea3e699deb2eda3c0991e3a6
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 10680 bytes
SHA-256: fe9ad0bb98eeb0120b01bb8a274c628a559770036d114d7aef1fe508222b9c6a
font_02_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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