Malicious PDF — malware analysis report

Static analysis result for SHA-256 46abb857c27f6930…

MALICIOUS

PDF

109.0 KB Created: 2021-09-05 20:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7720574fa3c1622465f9ba580d450ced SHA-1: a4f9e13f55d07be50a0931795d588804769307de SHA-256: 46abb857c27f69304949f80837ebfaaa47d460459c95927df61c38936538f4ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm. The PDF contains numerous URLs pointing to potentially compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=grand+jury+manual+doj PDF link annotation
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/df6b14ec8aac5184cb73c8f8717e2e33/67972145115.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xinomunuvuwinipawuniku.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/bukagudafopogizo.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/40219491620.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zururimapiritemilosev.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/75148126753.pdfIn PDF document text
    • https://domilot.com/uploader/files/67221755299.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/medik.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/52414688807.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/redinovemi.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a7aea80d686b1202fea17c4645927936/nudosususib.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/77767265640.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08b81d686---gokogiterofowupar.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/dc925639dbefd09e61285d06953da5e0/29689048127.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tedegilikamomusazonose.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lutolamuz.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099cffb38811---siginetifesegorijemutike.pdfIn PDF document text
    • http://hrudolf.com/userfiles/70168446442.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdfIn PDF document text
    • https://olterus.org/contents//files/zanewemomibofifirawoj.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/9163475529.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_off000144f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F0 10300 bytes
SHA-256: 8ddb565358e9ecd1261cc9142804340c32f7965291c865e4cab4bce071d00f50
font_01_sfnt_off00015c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17429 19444 bytes
SHA-256: c1a54d8918bf65a50d85cb08b0ffbb65c52a735c94decd1679ace0eca7edee2f