Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cf05e9fa58275e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 01:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1e3b692ee4d338e17b5f9eb34be101f SHA-1: fa24f8c018509b4dec4af45e2307c7d46ed2dcfd SHA-256: a6cf05e9fa58275e5d5f2f1a67e42ca9bf98da36b7802d75708c867cff546c5e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=traffic+car+racing+mod+apk PDF link annotation
    • https://eownauto.com/uploadpic/files/gemegutisifawadifif.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/senosiweba.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/rexetinevulatew.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wozewipomive.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/66958758765.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/zonirupelabesazexobobaguz.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132234d03775---8743283841.pdfIn PDF document text
    • http://livestocktool.com/d/files/41426432209.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zoziwaj.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/16ce9506196e006d642a15cc82753bc9/suxewofefosopig.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/wofosiw.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/43703836629.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/gulovafupetaje.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb539a6d8---lefejuvipebewix.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/22887220711.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210911_202253.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284f773acf---runimexasexer.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/86451790847.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/96938031609.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/bubog.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/99395973192.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161314de6435e6---26607039289.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/16180521073.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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 16768 bytes
SHA-256: 37d1aeb69210240458bef5e72271b8d10e92f78633ff8456a173de29ab83b1be
font_01_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 10572 bytes
SHA-256: 3dcc77b6f93c41095b10981d1ca6915b414a03a50969cefffcced6486805f1ea
font_02_sfnt_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1