Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a0beefa56fba67…

MALICIOUS

PDF

96.1 KB Created: 2021-07-24 06:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 19f4a154e8766a0e88a2bec6da7e9ff1 SHA-1: 236d6ce57a52585dd8b6ff42d26e98274c1fdfce SHA-256: c9a0beefa56fba670af65f599a98b9ee5cba1c541f0a6bb45c683f944cdeba9e
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be compromised WordPress uploads, suggesting a link farm or distribution mechanism. The 'Remote-support tool lure' heuristic indicates the document's content likely directs users to install or connect with remote access software, a common tactic for gaining initial access or further compromising a system. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://xn--9w3b11kh5l.com/ckupload/files/gokapeze.pdf In PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/56115244972.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/nunuxifozifarezixelof.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/24ef1c1797870b08209d64093036bbbc/80996181487.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/424e390fb1f77f7a494e4525c26fa3ee/56967404755.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07fff0bdb---womipebewagidazizipukiw.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xasezovawapizajalexumawip.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/gosebi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/t797qse802jvob6nkck95oiki9/wutifokaxibova.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/majevirigulatinux.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/gujetabotunitedera.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/65037560377.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/33230706102.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/84124847689.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc422ebf0---galadaf.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3aead842c---76630763191.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/86264685772.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ace915ec4---ritabowitebu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m9fb2cv7k0dd6f7l5namktngq5/pebixe.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/bilinerodowepag.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/tevukimoravuf.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/51793353663.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835ce1dbb84---jugomozefabobel.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/43f3584d88a0c62ee69a329818e07ff8/dediwiwode.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/43736652653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=whatsapp+animated+stickers+group+linkPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 11148 bytes
SHA-256: 39a4e1011b353adbf0ed0361e1d493783a1c1d13c528fc0f3e3e1b14afb6f5d2
font_01_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 18988 bytes
SHA-256: fd001b7a03146e182e060db37eae57274a6e7f15c78ea305dc9d4df5ce43ffb2
font_03_sfnt_off00015a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A80 16360 bytes
SHA-256: 635840774cb058a742dbdded72a0b1b6f766e43976dd78451fc8a5c80ec47747

Open this report in the interactive analyzer, or submit your own file for analysis.