Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca2dbe5aa3f10d6…

MALICIOUS

PDF

89.4 KB Created: 2021-06-26 11:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8812745f8775d35d792d6adfff191831 SHA-1: 054f3b8ab42ce16d27ee9073a365e1418109e5eb SHA-256: fca2dbe5aa3f10d673b4edfde0396a11ded3df23d6fb8ae37426931ed6dfeee7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to facilitate phishing attacks or malware distribution. The PDF's structure and the nature of the URLs suggest it is part of a larger campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=flashes+after+retinal+tear+laser+surgery
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/5a73e92c1abf6a292d6294e420b67dc1/9341254720.pdf
    • http://pcccphucvinh.com/upload/files/jumubelowadek.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160780029cc997---kifomofibebi.pdf
    • https://hondamienbac.vn/userfiles/file/kirafupetozasiduxazepu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a06194847f19895ce1026576ecf88048/96685061128.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/nowasuw.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/42356446960.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb68d4a83e6---duwajusejuxulivorabuz.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/22ed79d327f60398a603d1b65725ee1c/genibiboxuso.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/agvnkjkvhm143b3geghacqihg7/16173528918.pdf
    • https://agronlogistics.com/userfiles/files/sukivovosanuxidifusani.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/sudularuwimenafalemusigo.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8e0b846496d404c32a58246e480dcb52/paxirifajikokuvoda.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb1741ae2---fiwuxepedi.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f06b74b7---92607203182.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/66fda0b7bbe1b3325366b7f8989bb399/xodiwabizexowodevojezulew.pdf
    • http://aucoindeshalles.com/menu/file/lefozerexibuxeterar.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b497878160a---farituxuwog.pdf
    • http://digitalpolicycouncil.com/imagenes/file/salexabadilunonuruto.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/nk39qe1ihfbijo7vetoiqlommm/49289347959.pdf
    • http://vervesimuhub.com/userfiles/file/rakasedimogaxowexuzabeku.pdf
    • http://synowka.pl/galeria/file/xefanojedel.pdf
    • http://angelcabrera.com/FCKfiles/file/ropif.pdf
    • http://resetimpianti.it/reset/public/file/56446653769.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 16792 bytes
font_01_sfnt_off000112c8.bin
2bdecd99da7ce8b348662533badb46499ab61c7dc79c904ab5abad010d043089
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 10564 bytes
font_02_sfnt_off00012aca.bin
1a001aa7a24d5a1e4d41f61f8e0bda39244a5da888cf15ed401b2aa0aee4ef2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACA 16788 bytes