Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b99bbaab6805c0…

MALICIOUS

PDF

101.2 KB Created: 2021-06-25 16:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fefdf759c4bc76d29710a3847ff71667 SHA-1: a3821cb516cb8a561aa140d61588be568a4f43d6 SHA-256: 04b99bbaab6805c043c28ad0a673191b2749e70b176f9eea398c1d1dd59f4bc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9deca17b---lepukejonamupitinujuz.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbf59f74c---12852515221.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a15c8d64---30929504811.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9ce199367993ac59692614ee03d8f2fd/vapel.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a83585e74a60833f3ade4fb6ec4fb3c7/54069731175.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/gorebuxar.pdf
    • http://inwallendorf.de/userfiles/file/jujatilapofokudodidekemok.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/43b3dd29cc49b59bebe823c4078badb5/neriporizupujofavugop.pdf
    • http://anthonyvienna.com/sites/default/files/file/97475309005.pdf
    • http://zs-oilfieldequip.ru/d/files/nodolus.pdf
    • https://stiff.pl/ckfinder/userfiles/files/segib.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2e029ffaoetjtskocq834kjc42/80015662040.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/500f4ccdea03020f555f87fa96c51add/55973624305.pdf
    • http://effektfilm.de/files/file/lagifarag.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fho35fc4akl167bl1pn6ikeudo/99591188032.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2a3e5799b---6567294111.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=push+up+one+arm
    • 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_off000129ee.bin
b53c7dece1fba9779788a2a9ff5440e5f434ce4f91827675fc17ea8b1e92d743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 18020 bytes
font_01_sfnt_off00015935.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15935 16792 bytes
font_02_sfnt_off0001714c.bin
afbd31096239620a1bb11bfa720c3ca2dfbf0f50631cd011f1f03d5f0f37eab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1714C 10380 bytes

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