Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefabc4f24bbd4b6…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 23:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8700a97038b48a8cfae582618d75defb SHA-1: 10dc4f7176ab8d0ba951c55f5597712e70cd9512 SHA-256: aefabc4f24bbd4b650e8b3f9b5dda1703e0cb246d88fc7c999f5688d9b6608a0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farms on potentially compromised or disposable hosting suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=a+quiet+place+2+streaming+partner PDF link annotation
    • http://euromarkcreations.com/new/fck_img/file/32302815310.pdfIn PDF document text
    • https://isleo.com/i_photos/file/17566763984.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021981812328905.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/bipupo.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/13bc333bdc6712dbb7f35626b11ee7e4/dafulesepudop.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/75224928623.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/8751807653.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9a40a5b782b37a88977073aa2b75c0a0/novinajowezifutof.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/dilarazerasulobaf.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210912163142086240.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa010455d---bopalevusa.pdfIn PDF document text
    • http://chapelguild.com/images/usr/24460750172.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/degifes.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/80433777464.pdfIn PDF document text
    • http://health-bridge.in/upload/file/38101739740.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/82130341774.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/27865918417.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/34889488240.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403374192a6---36935807162.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/64890141627.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/8224495882.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_off0000b539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB539 16752 bytes
SHA-256: 389ec017d7b47729f4aca6e2d040b1dfeccf136056db5c43c69e3249a4adcd5a
font_01_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10944 bytes
SHA-256: 67ac1189320d054d4c28c076a9853d5fb7f34061d8bdd79874f2bcdb49f2fe00
font_02_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1