Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc99979d5ab9e85…

MALICIOUS

PDF

88.1 KB Created: 2021-06-28 00:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fe5514ecd3533456c998ea062a96129 SHA-1: 5cf14ee00b20fd7c0aa7a13fc10bdbb6b3cd6c12 SHA-256: bcc99979d5ab9e85da95d62979ee22dd599fbf04b7f6391a72912e3e97ef8302
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1aecff774869aa2e3904db0ffb7ba4a7/46769355073.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3745e26a---26477443472.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a093b38a2dc---kiwaxugubiwefum.pdf
    • http://flexa.cz/docs/file/43194829268.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7775a9e95e---17199916171.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/wugoxa.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094141295afa---23725700885.pdf
    • https://samarpanbharat.org/trila/userfiles/file/gokisutewesekulap.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607523e311271---16703324017.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0632ab911---44103314825.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a811488ea22---35808946342.pdf
    • http://klefmarken.se/upload/file/zorelakovujasize.pdf
    • http://skogsformedling.se/bilder_umeny/File/bobewugozewekisubilo.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c75e153f8---zaxaruja.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160984c6d7afe3---16417350031.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/42bc3f76669d47a3e53368ab680fff6d/bomowilesamexixiwewovisu.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/bee1tutbc8215mp9glquj4vup3/80107933304.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a1140641---wojefatubep.pdf
    • http://s-moonlight.com/CKEdit/upload/files/giloxetete.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf19df2e20e---10381374416.pdf
    • http://falerisztika.hu/tmp/gatenika.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6ac7b3bd9---62147858900.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/10487564396.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512060857344819.pdf
    • https://anmoul.com/userfiles/file/4610379404.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=look+at+in+spanish
    • 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_off0000f445.bin
1a28b5370d913f0deb75723386cdfafaa1b7c4cc9e7dc9a48c73198ce74c983d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 18672 bytes
font_01_sfnt_off000124a4.bin
29e1ed44567420b6e5e91c42710baaa7511b288f7414218f3b7836a14e6133c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 10120 bytes
font_02_sfnt_off00013b2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2B 16792 bytes