Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87bccd448e820ca…

MALICIOUS

PDF

154.5 KB Created: 2021-06-26 22:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13acc74aa5e89c0c8c8c43465ac79ded SHA-1: d5e3ca440abf84d7252610d868a2549133cac8a0 SHA-256: f87bccd448e820cadf7ab43dbba83023646385558077df235d2c6e7bc9a59110
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious phishing lure, including links to compromised CMS upload storage and a link farm on disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick the user into believing they need a password to open an archive, likely to bypass security scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crewmak.ru/uplcv?utm_term=looking+lean+meaning
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0307546028---nivubomawonubuxavuwebosu.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089ddddab2a4---86198866962.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/bolavebumu.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f40c03cdf6---rosolamer.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b241e9df871156bebbcb3314295fecd3/92568900115.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/67465243430.pdf
    • http://uralinteh.com/uploads/files/jurudovekezemezon.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d73c958b---xelevawomipajid.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094175ae13c2---zodexaw.pdf
    • http://provia-events.de/pics/fotos/1/file/javixaxewazuxidixarufi.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607078877e664---zidifoxozuvikukimudopafus.pdf
    • http://poolprotektor.com/userfiles/file/tonimegobujumige.pdf
    • https://thaiwoodengames.com/files/upload/files/63414732682.pdf
    • http://clubselectionvoyages.com/images/file/87316185048.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e79cdf924---losejuzikori.pdf
    • http://constantcontinuity.com/membership/data//files/34965123409.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9d54c9aca3---zijajawuloguxaposizu.pdf
    • https://dakhoathienhoa.net/images/files/jirezoxevebufov.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/r2dmkfsnutsltd6irmc1ko0k37/duvovejo.pdf
    • https://bbpartner.cz/userfiles/file/46321950161.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba70e6bf982---sulog.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbaa8964c2---semalemidapurawitebeko.pdf
    • 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_off0001fdf4.bin
06851d5dbcf7f0210636f70b408cb42d15062051972d8aa975f001e7a9f412fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDF4 17708 bytes
font_01_sfnt_off00022ca0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22CA0 16792 bytes
font_02_sfnt_off000244b7.bin
4e5ea7cce07c0b4c179fd351c2fd538e959ea7bd92ccf460e5f416e0ba323a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x244B7 10136 bytes

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