Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e34af5b6523f804…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 18:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a099d8c05fa14e3ba6ecc7a8751f81d SHA-1: 6c977114ebed1c99717a14acf8cbf10619100f84 SHA-256: 3e34af5b6523f804d031b33c0da7992f755235a2298fcf39d99a240d07e11154
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=wd+my+cloud+music+player+android PDF link annotation
    • https://premiersuli.hu/files/files/punivazaxotazekitadumej.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/85146129311.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/73810015355.pdfIn PDF document text
    • http://xhzhengli.com/upload/56542486715.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/zafisipa.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/71495519237.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/67066924417.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161393a3aa65f7---vikukabegulakawevil.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/80586205714.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/zevibegiwekisofunijakoron.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109080203257846.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340664a45a9---lorafuv.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/jusakova.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/46062372987.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wabovuv.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161396bc3a895c---53906129352.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/82727218268.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/25001118759.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef7a0c96f---11320217374.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/37506968454.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/beluli.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/98375009730.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_E37E17558877DDE4.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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 10784 bytes
SHA-256: 2e72c1918d947ed7e39d24c280e23e9af44ed143403b9225fa6c3a053df58f31
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 17424 bytes
SHA-256: ff26737ed85699d2aa563c576943499d92332079c4117565c66bd53a5ecf5d57

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