Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd0e682e9af4f36…

MALICIOUS

PDF

100.5 KB Created: 2021-10-04 17:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1590a2c584c8e0470c93c62c2f0df744 SHA-1: db634bb38d0903141253e607c2137be22f36026c SHA-256: 6dd0e682e9af4f3677d460dd66c0abb0687583322e778e0652fa36a6fb439fb0
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. The primary goal appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://queure.ru/uplcv?utm_term=definition+of+nonsectarian PDF link annotation
    • http://lexprikson.com/admin/style/images/userfiles/file/25316622425.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/kipud.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/62994785327.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/36e32b66b677ca92c3c6cd51479db216/gagebuva.pdfIn PDF document text
    • https://fototipia.hu/files/files/fiwedazesedelixarilirenib.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d2719ebd---wipenoralugesamelagad.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/lagedutojaluwojajeve.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/17081688797.pdfIn PDF document text
    • http://zuche0551.com/upload/file/nijivuxukozifadatoriki.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/83459565093.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/xefedobepetapotu.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210911084920.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/33643672714.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/parukenalu.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/70319332256.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/77590998446.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/34447264833.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/natunevitimik.pdfIn PDF document text
    • https://limadelimon.com/images/file/jogaraf.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16156827c083a6---71396047278.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161455559149fd---39453752951.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/wabizeromovedekawanawa.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/38502480197.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/4281125457.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_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 10284 bytes
SHA-256: ac6c4d2e05cb7e82ac5a548f656da97fbc2fa0ccdf7b14400043b5ad2f24bde9
font_01_sfnt_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC4 20684 bytes
SHA-256: 6cca408c4bbaeb57397aa2f02ea6300805f909fd2d8fb73145c70559adbe7d90

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