Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b044bfd974ef843…

MALICIOUS

PDF

91.3 KB Created: 2021-09-02 15:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 361fb28b556e7a90b99658379ee2f188 SHA-1: aa14b7bd030b17f9338e4b79f9f72649c51d36de SHA-256: 8b044bfd974ef843f55e88b94f56533d4c959c04c230d004e83dc3bcbbfa23a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://atut-biuro.com/uploaded/file/kimanazemamejis.pdf In PDF document text
    • https://samsungklima.net/upload/ckfinder/files/31427766425.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/75176403280.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160be88a5c4eaa---mubojafovirara.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/zanafuwiluguxibip.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/11110440392.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/bbf161a36fd6b3fe6daf34bc19793c7c/36405758410.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9bde7654f6025ec557156d680f3173a2/jexixozuvif.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d535a599200---vagoboxib.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/93525304801.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/divejimepike.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/90894900949.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/09aec8a2009f25c38894bc344d3e80de/39523451726.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fd063ba89eda2fbfe1f105fc5bcd3ed3/mulakovademi.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/fabusesize.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0790c7c38831540699043467bbf8d395/depusegogijowufok.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/wusenalugi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e5b7163c---92161871751.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/33d3d3c3a9ff9b2fcfef3889e3d81426/45026294881.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210708015858117127mitsju2f6a2p.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca07feee1af---lerawulumidifejoj.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/03b0b220d7c8c7eefeaf25d21dd663a0/kozapapazewemaxogubomop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=autocad+plant+3d+2018+manual+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_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 11044 bytes
SHA-256: a12e4db498b59e8eaeab87b79d3a37f3f0fc04db3ec60e594f59b667ebf70398
font_01_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 18248 bytes
SHA-256: e2189b350cc8f33d29822f3977c87ad604a7470b1fee6a8c60f8a9f04e770c9c

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