Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8d31a541844de2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 17:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f91891a6018c4c98913f485e5928a954 SHA-1: 75420eabefab6bc8b1e1323687f63f21a344c0df SHA-256: 2c8d31a541844de29632d850c6369ad2599fefe7e46061522026e4a28beecf71
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such documents for SEO manipulation or to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://fl-forever.com/upfiles/editor/files/mawubogodejezoregepegeb.pdf In PDF document text
    • http://thaoduocvn.com/userfiles/image/file/kixajewu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bb8b13194fa077451d96b0c005bef042/bapol.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca6322286---gikawobabezuwuxinesekunaw.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210802_FBB12B7F4E3ACF8F.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/ribitit.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/wewawafavapebiki.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607686df2a4e1---nizuvubamonogapidinanug.pdfIn PDF document text
    • http://yaan121.com/uploads//files/202108131806425976.pdfIn PDF document text
    • https://strechybenesov.cz/content/lazuxelasa.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/livurax.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa468057c9---jirimopisajonejisejog.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9077518d7---fedusigalogepenori.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/aa87e27c802c87ff91172736888d5596/xofolumituzipivufuwolev.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b3a087fb7a060c3682d9cf1858c430ae/62979963135.pdfIn PDF document text
    • http://foxhill101.com/userimages/91073505032.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/44728670327.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffecb7e7ef5---36148002257.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073a37de3379---26340374631.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa78e276e55---22046127545.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/44308859662.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/66508277788.pdfIn PDF document text
    • http://pvvc.cz/files/27988717789.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/59085697420.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/63149872587.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/1323024807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=properties+of+air+table+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_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 10528 bytes
SHA-256: d3f8ef6a86655b870ea2befe0cbec95b236c1cbae410dd62580b990e15c29717
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 17428 bytes
SHA-256: 0f5350ad8b77d4c0df995af6c5d8579906ccabf28aafb67052f57cd3f1db58ba
font_02_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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