Malicious PDF — malware analysis report

Static analysis result for SHA-256 802ac31065f1bc47…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 23:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: bc6c19cb6a3bcccbf82006992848a050 SHA-1: 819f5dd37a1706dcfcb3fcb81e7c24eb745fbab0 SHA-256: 802ac31065f1bc472d4ec12ce4aaf8cc22bd6a51eaff602ac46311e5c8f74ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://amghanoi.com/images/ckeditor/files/98590429232.pdf In PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/76821844806.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/fukogexuluxodiju.pdfIn PDF document text
    • https://combrooncom.com/contents/files/93529733081.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/980346109.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/29019442863.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dlhe7mdqr0m9g74fvpctoov5ld/35737564976.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/padijopaxiposadesasod.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/zazusonekilenatenefuzu.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/34393676797.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/19907963071.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/mepotoxuzolafexinusin.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/v5e4plbc3ceb95hhqeks659l24/gajurozap.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076b12c594b6---24167276414.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/melezararowifomivewoxo.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/zinapagefuborejinatab.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6346bd2355---tekawedujavuxiwimeredo.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/jojafu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/81a6b674a0adde633934b928012bfa28/metenotivizapuvovowu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/csittpcdclalb4vgsv8hg3g84m/21320095628.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/70350466727.pdfIn PDF document text
    • https://digireg.dk/upload/jonerarizizijol.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wosegijetomexenuxeluva.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852856efa5d---76128282825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=book+3+kingkiller+chronicles+release+datePDF 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_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 18520 bytes
SHA-256: a76b84a5ec0f7099b58e60a581a95dcc0283debf1c8c28921cf7bb707de17b1a
font_01_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 10968 bytes
SHA-256: 37082bdd1269d18d7f81b6dd7f3588448a86215c5762f4b7c353deab2314f7fe
font_02_sfnt_off000132a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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