Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0d212b9e2f7431…

MALICIOUS

PDF

94.7 KB Created: 2021-08-15 01:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f329e7dafee4734dd928198ec37b3377 SHA-1: e5e89e5aecf380bad88eaf3ca26bfaed43293f3a SHA-256: 9f0d212b9e2f7431750704b769ce58c9df07c0b4e28c049ddede7b3097d2a913
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. Heuristic analysis revealed it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF files linked from these domains suggests a coordinated effort to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mavibusiness.it/file/gatedibume.pdf In PDF document text
    • http://digifast.cz/userfiles/jokopoxafipejo.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/bokapivanujoputatijafax.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/48041817412.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210704162537970425.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/xadasadusa.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/vuzelixojimazenirodu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2fba00475---kapezusamugut.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/5160963258.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/54065657448.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/22875494740.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/48818500304.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/65239127485.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/49386634625.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/32267972133.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/dozirimewodovorikof.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/38b5b6f33fa7b1ce9fdb3e75543f80ea/boganina.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742be2d0257---supasibedugid.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad69b595b---bojogikot.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0fad1e57b---zasiruw.pdfIn PDF document text
    • https://davaocarrental.com/images/file/56287500977.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd18d434763---86434737378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+araba+mod+1.7+10+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10844 bytes
SHA-256: cb51f7b6f5023368a87252adacb8daaad5d9389ee95673fe3c8711d934884409
font_01_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_03_sfnt_off000139e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E1 20012 bytes
SHA-256: 08231bb6855b06f6c7401b21f3149dbb933c7d8b7151e4e7a82e048166fe4887

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