Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba7cf2f473aa252…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 16:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aba8e58360a5cb86b6bd8260d6df9032 SHA-1: 1d4892d674c08a09eb0d2d29d8226e64a6a83543 SHA-256: 2ba7cf2f473aa252e1e11f5e7713335d1a7ccd4d432a7d4260f070113b9cb7fe
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to external PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The primary purpose appears to be directing users to download further malicious content from these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/kamikade.pdf In PDF document text
    • http://megat.pl/uploaded/fck_files/file/89603534786.pdfIn PDF document text
    • https://wrd13.com/force/file/raramitoxekapezamokowado.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/makoti.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/mebenirobaroxaz.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gogidabuwef.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/72741824678.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/54804085679.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e0db6d56b50cfe814c660dce1564d7c4/sezizeguwiwefetoges.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/19663084450.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160812033a4ec8---fosigoj.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/javexejajesirijunisonakan.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6a50389d---mitavawirif.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4076b471b69dc19ca98b81513a76d66d/4547042151.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/26a90437c2fff8b7c020d60f1530210a/7051103707.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/vobedibipa.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/29710034660.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/41618032097.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/4095865518.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/db85d0537cc74d9c54b7c6cb6c272c1c/galiginu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/4981640299.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/bikawugo.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/76544776763.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/556c50b82e99d7d918f4189432d8820a/bofesivuzifikemawak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=historia+de+la+independencia+de+centroamerica+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 10772 bytes
SHA-256: 570dfac7e2acf92115711944ff12b6c2242c224db00e11eb93b09e378f0d3e15
font_01_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 18580 bytes
SHA-256: d806bddcba14271e4b7c6edb73178425ad1e9136a96deae404dd1fab458f746f
font_02_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1