Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a05b8040d25eef…

MALICIOUS

PDF

106.6 KB Created: 2021-08-25 14:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae29eb0c491ba162ac42ebab812541c0 SHA-1: d008d2e04355e05cfb89b03ee47eeea6a44cc26e SHA-256: c9a05b8040d25eefc2b9619fc781d90a98f9597a1d8052fa5be848b51554be42
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to potentially compromised websites or disposable hosting, characteristic of a link farm used for SEO manipulation or phishing. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links strongly suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://mayinluatudong.com/uploads/userfiles/file/mevataxa.pdf In PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/95e19180d3ca6ba03b226468a85c1d9d/28896039930.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/5031242045.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/lupazusebusotaragokafe.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607beae7366f8---43758235033.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/wasorunalokejaxixil.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff7d229b7---bovefosiwe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d472b312a8.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/69730166044.pdfIn PDF document text
    • https://turbooto.vn/upload/files/wilup.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610063cfa626d---92587416053.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/94022169576.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/pugewunegawapobupi.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/56958890471.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607911496fa6a---dukijajaberobomilijes.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160946b8aa74ba---salus.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078030538ff7---98476260740.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/22673312421.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a55039f8b---viwixerijeweteduzegi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/nawejobalafopofevogepido.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2d65a6e728d9c8f510eafa65462ba3f0/18746013399.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf5519272---275748888.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///65645522885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+english+syntax+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_off00013b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B83 11164 bytes
SHA-256: 28851825660f5733a24643432f5049c747bd1689c4c349bb23e1449ab36a8879
font_01_sfnt_off00015563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D75 18884 bytes
SHA-256: c742797a2a5c0f263ea0bd2a9b9cca181a0f4956998547168868a802d9596dac