Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e7d9e911138c3f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 10:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3603f56ce0c4de804098d1fe0966a748 SHA-1: 40880d0d30559aef85f3de752a2a6607eb236a8c SHA-256: 98e7d9e911138c3fa7183cfe8efd41b1ffe9007b72ecb00cf718d5dfc87e48d7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Numerous heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress upload storage or disposable hosting. These links are likely designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://synerhu.ru/uplcv?utm_term=notion+6+manual+pdf PDF link annotation
    • http://uk-finansist.ru/userfiles/file/sonewujatozoze.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/98038486925.pdfIn PDF document text
    • http://snft.ro/media/file/bobofinake.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/tetevovobufajipadu.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/biwuwiva.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/ac1cfff1c3c9dabb938204c26e449ffc/fetobixifax.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/zugipigoj.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a0b6b9a201a82d66945a1900b02aa149/69119632107.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/281917233940.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984249cc29e---luduziritemuj.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160920461d4f02---bejeked.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/nebawadezopu.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/depitukotepazizadiwofa.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/5879756518.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/88cc0ffc607cebe3464e3dc18fb1afd2/toviwisorajepise.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8d11b50b3---japimitepe.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/33185871827.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/mebefedajeg.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/59259800542.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/wixojudisujaniwajisozito.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/50263128172.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/85901624589.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/er08b2cgesud46qbrcul6vgu48/31350153563.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/32617123451.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/fovobe.pdfIn PDF document text
    • http://balone.net/_upload/file///19318390789.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_off0000b477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB477 15020 bytes
SHA-256: 581fdc5bf04c81651df8188efc8553ec97feee324496ac406ca35c1dde78cbbf
font_01_sfnt_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 10504 bytes
SHA-256: 98fcbe9c819188e3fed50d68c6318eb9aadacc5b1abd256cc84bec8d52f8713c

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