Malicious PDF — malware analysis report

Static analysis result for SHA-256 419d0c55c003389b…

MALICIOUS

PDF

88.4 KB Created: 2021-06-25 18:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8efe0b22f572d454e4a10a43e8b3631 SHA-1: 7ead18852508360718894eb6bd722c823ed07828 SHA-256: 419d0c55c003389b13c639f33c008df4079fcbc7c86dd366005bf17d548be26c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160832f6592f87---95267295295.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb979d2bfe---matadisafe.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0956ee0943---lejax.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/soglvbubocv2u0t193tap6kc1h/64298239584.pdf
    • http://bixenony.com/userfiles/files/44188482504.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608633c8e3106---60070556326.pdf
    • http://www.jindatunnel.com/up_files/file/50608400363.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bf2c2bf1890e50467b3f679659639092/16429117488.pdf
    • http://vivatbacchus.hu/files/file/87596892234.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9198d8a50---xolevabogid.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b49fe788dbca6446a92c5deba3759421/gifenogimuj.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ccc40f285180c81707a81c336c74af05/vunozukelanaka.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/0cdbe47f0e4ecf72196673225873c2ed/vimixig.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa4e5d10c---45660024230.pdf
    • http://xinyuemu.net/assets/202106/files/20210616172155114428.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1d380cca---pamerakumujexijasu.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/uho3q83dtkg8lke3s1hhp16hvp/78709096041.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/23b55e64236633b98133bd44f11ab633/bovipakebuxep.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b011e189---80405887089.pdf
    • https://henklinders.nl/henklinders/upload/files/34612761606.pdf
    • http://nextgenship.net/upload/file/20210617162397193939.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2196aba58a---67429764675.pdf
    • http://kamerton.nl/clientfiles/piwudezelekazojuxusize.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/83875048274.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+time+of+day+to+catch+crawfish
    • 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_off0000f77d.bin
5689362c5f43ec08baf2a2a5ba5c8f1670f64cd4b8196367ace4a59b4d427db5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 10844 bytes
font_01_sfnt_off000110ab.bin
c2f7904bb60dc711ba66dcb7037a2da3c4516600f9d17685added08559abc8f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 16992 bytes
font_02_sfnt_off00013c19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C19 16792 bytes