Malicious PDF — malware analysis report

Static analysis result for SHA-256 b395557721e3c697…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 12:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c88b441013cb3f81a5ed64cc0cf8a985 SHA-1: e0c664af62f5599bca8b5676bcae566a3527775d SHA-256: b395557721e3c6974a8aa2771c5a256c10fc8cb01a0e5fae210437b7f2358be4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories 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 distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://cokhiminhhien.com/media/ftp/file/xokesutawa.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5e09f8681172abf17f62d643fac49d04/nasusupelelito.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/wanow.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/04l7qhh72s43d3p6nlker9sqm1/berawukavukepojol.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/61038212012.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/67221514093.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/79e0f666a2400e7ad218281c3f998f33/nevax.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc3eab063---zupogapivovaxefutokiliwox.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3c9ae949---1998936256.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/tilolugevuko.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sv40jkflh9q7ksb06mta7tqap4/joxaxeripokoxalaso.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d3afb9c555895df4d5ee9f24bc0ffff1/61980234981.pdfIn PDF document text
    • https://emprenderem.cl/files/59631155901.pdfIn PDF document text
    • https://kildevangen.dk/files/56635948161.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/domox.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/riwuwapulixexevez.pdfIn PDF document text
    • http://yuli-china.ru/d/files/xusenoditan.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f5dfaee9dbe3ffa17f4aa0f5c6fa10f2/fufosabex.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d10047a4c1b5245bf8b1a809f5907b8/faminelokabakoriditabunej.pdfIn PDF document text
    • https://numberonerevolution.it/file/xemedotomolabagoxuxow.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/38773535116.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/01bf2e16f510c2681eda734824252cd5/xikadexagugulojagoguje.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c6c558ec7---81154295412.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/29868728334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=inhalational+anaesthetic+agents+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 17496 bytes
SHA-256: 40c296bd7e67dd03c7e86ea58fcde1a69cd119cb591692a5cbf7370dc315e98d
font_02_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 10748 bytes
SHA-256: 7b9c01852e9d0729658af072b0c1d27c9031f9d3bc02f45c367d55e450974143

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