Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0d8b3c4c1f0117…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 04:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b5efa038808988572b94552e62ba6db SHA-1: a125ba2c9e230f8c5fb511b5f7f516700b60b2f3 SHA-256: da0d8b3c4c1f0117fcd3fd0a8dbf067d32d30c6ec07c42e6f67e5b46c245e00e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bonacorsi.it/file/93881223324.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31ded155a5---natifupowas.pdfIn PDF document text
    • http://weingut-suppan.at/files/xopezalobemaro.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/betojovunuxemogad.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/eskn67mdr9ke0t4ruo5gu38j52/18176690520.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/fukimuvadovokefi.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/88942507287.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/rilosuvakuwu.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/35320842064.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/netaxapefeg.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/59213624156.pdfIn PDF document text
    • http://katachizu.com/img/news/files/58414423945.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e22d3b78a0216bcfc17ff4592e3bc70f/61127256110.pdfIn PDF document text
    • http://hzqzg.com/d/files/vesejewe.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/71254354941.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ca34ecc80f84465f3dae6efe10618016/40066138388.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/37777062791.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/wotum.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a8e08f27---63543221223.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8653fc55cd---11344945954.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608581325ee73---nuwobibamobupofokedov.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/vaxuzopodavipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=photoshop+select+one+colorPDF 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_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 17892 bytes
SHA-256: 743a12c2073791e82155ddc40029c110bb9556c63b25c905c0587c9908904461
font_01_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 10216 bytes
SHA-256: c84ddabd5bf33744535699077e959ebb3372949e048ac1d71af593d4e3fe696f
font_02_sfnt_off0001265c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1