Malicious PDF — malware analysis report

Static analysis result for SHA-256 d428c6070f9a259e…

MALICIOUS

PDF

74.6 KB Created: 2021-08-31 10:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a03a0b3c5a89072b1a0c3c3c67f30d4 SHA-1: cb1cd8700a9e68261c7837ebb9969ffba1f0ab79 SHA-256: d428c6070f9a259e47844295d546277d79e668649ff4668fcaf0b09e14f20ed9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://solarhomepage.ch/fckeditor/editor/images/file/55823857797.pdf
    • http://assushop.com/userfiles/assushop.com/file/lekiniluli.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/j9eujti4lkjls8ldhab9l0e4r2/gopoz.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb061a619f39139a8191cdda953471b9/kurutipilovelekokimutuk.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/zoderadimebelefoli.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4tkhm54jhv8mmutpvj02sfhd8p/66529207701.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c6492c3a---rofomilos.pdf
    • https://pharma-tools.eu/galeria/file/luxisiboxamuf.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-7-18/20210718232439111297.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/46728e8ed8a3daef61b884bce1731cd9/54824829453.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/mb06e3uk5n0hfvmhn4fjkcj993/lebojepikarugiguwu.pdf
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/kufusefadi.pdf
    • https://www.passion-rnd.com/upfile/files/2021/08/08/23388159425.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/31976743012.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1bb37dbd4---70055500699.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855579d100e---toxozegiv.pdf
    • http://tortsurprise.ru/upload/redactor/files/94538479520.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160842cc42ffb3---58667835715.pdf
    • http://portalpr-b2b.es/img/user///file/_0760316001628110034.pdf
    • https://pacantioquia.org/aym_image/files/28200794729.pdf
    • http://bezagsecurity.cz/userfiles/18398565877.pdf
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/80298159504.pdf
    • http://matras-devison.com/upload/file/82131789951.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=low+carb+ham+and+cabbage+soup
    • 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_off0000bd8d.bin
57c0b88ecd6b0021f78577fb6c2ef9465e9cad463a1ea9f1b63a7f33740414ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8D 16868 bytes
font_01_sfnt_off0000e8fd.bin
42ba24ec019bf7fc4037eedb8045f475e1c2a04defccc6e763fb9540803fe593
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 11008 bytes
font_02_sfnt_off0001020c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 16792 bytes