Malicious PDF — malware analysis report

Static analysis result for SHA-256 29378f849fc57c93…

MALICIOUS

PDF

82.4 KB Created: 2021-08-30 15:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc13ddbc9b003c6260cc66b973358f45 SHA-1: 18794bc5860da719fc7ab5d6735c64fba745c6f0 SHA-256: 29378f849fc57c932c928684f2dd7144a106c8e9a1513700f18a8927577eaf9a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS upload storage. The embedded URLs and the overall structure suggest an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612345be89325---zajumokujuvejoxi.pdf In PDF document text
    • https://farmaciasacoor.com/site/upload/file/bavegefo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe4f4f69b---tilajarez.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16112c0150a065---57055859640.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/fifisonikutiz.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/xakejegipekibanamuvab.pdfIn PDF document text
    • http://hnspkjx.com/d/files/15158602870.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/1915777767.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2aff32a6977e24514c1715291d9186e4/3613604338.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/funinakamemosopuwe.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/fazefotetoz.pdfIn PDF document text
    • https://svltv.in/userfiles/files/41011680505.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/498aoneoae1f6vo0qjhsb60k0t/25521468057.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210817_5A82C68D8CA9D1CB.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/39591633110.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95acf8c0ef---10659738114.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6alab0lmg1imkpljturbbmf553/65159112719.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa7db2b97---25763118780.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202108file/2021082208510570554.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/68a9897c79fe1522ee6db083c2820666/jupowiraxikujijemaxe.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/jalakabetomonobasegajif.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/pizozes.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/iiuj5qruc2gr9ujpaeiolb31qh/60657920868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=1000+sq+ft+house+estimate+costPDF 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_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 19404 bytes
SHA-256: 6d801df89d7689bcb1bc90d9581a2cce2f45f85107415d6bd2af8ab18f99b53f
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 10676 bytes
SHA-256: ff569d9f0d44a06d599b2bb7ace9cecdb01da285b8f4995db0a6bd57d90a5d3b
font_02_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1