Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9de9cd9d57a383…

MALICIOUS

PDF

82.1 KB Created: 2021-08-31 03:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5cb857cdd4e5d32a76441e18992c418 SHA-1: 349594955c04b3422849802063d05eddaf01e853 SHA-256: dc9de9cd9d57a383ad281fe448e34073139d8b3d85251a1e3a59c58871187728
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=how+to+update+iphone+manually+on+itunes PDF link annotation
    • http://lacasedescaraibes.fr/file/sokenila.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4229e7fa3---59823609989.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/97441508589.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b771d368e0294f7b67c6247190de271c/89521944914.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/rimezogenuzarudidiv.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/gaboxatuvu.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/lomitagemokawibedafes.pdfIn PDF document text
    • https://la-klamm.org/Files/files/bagifezisixeki.pdfIn PDF document text
    • https://spacio.hk/attachment/file/gemebonup.pdfIn PDF document text
    • http://falerisztika.hu/tmp/10163215499.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/57006355462.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd86a2350b---38012807890.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/guxexupujodeluputofede.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/nuvuboboseribat.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210506041914.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/95287a778adf35afc6f801446c460961/tatamale.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092965ba63ba---69350937542.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/73610055863.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/wutiwaje.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/d3occ5igakpnnjg9g4e3fq7tp1/xuwirupupa.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072be57f142a---11651726989.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5874ef4e841859916b4a5c2faa1ec078/lazurixonimeje.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa5a3b4a7---57404983197.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 10848 bytes
SHA-256: db9036892866df33c8c3b86ca4a0673ae59d2b90c8526372d6e5705e2c22ef9d
font_02_sfnt_off00010e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 17084 bytes
SHA-256: e61fb3c6507021b3631d208b326e787057ad9cb287ef707d4ac005972df2787e

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