Malicious PDF — malware analysis report

Static analysis result for SHA-256 a270a057c47b17f8…

MALICIOUS

PDF

88.1 KB Created: 2021-08-11 20:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81307b5921338b83351caccb2d5ccce7 SHA-1: 594bb0b2da059ad8200f6a375ff700ba4238e99c SHA-256: a270a057c47b17f871ab80377d1a3ab4b79cc05282902868b4b71f1b2c015284
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • 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 http://anhbanglaw.com/userfiles/file/pawevizuxulami.pdf In PDF document text
    • http://www.armstrongre.com/files/files/56039817613.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/77717136108.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974d9f31be6---84948054330.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/73451952818.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095b13a9cbee---33926833116.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d894ed5c58b---86697003556.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6c0da7eb---lurumujuxepin.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793aaf83ccf---23085477507.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a6367d867b44e95aa466f33362db3d2e/gunifepusodujun.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3b265ed2ce7cb10b270582ed567905c7/ribeponobidi.pdfIn PDF document text
    • http://cy2hand.com/userfiles/65091668002.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2afac8ec3f2458293b4fcc971fc61749/laforejuxex.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/nijuxagebominerojoretol.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///83485345828.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/bimedizonorizemutifatune.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7766f7123d---53691836191.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/68800607296.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/sexogunidapivivef.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/94812515739.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/302000506128.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/80782658406.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/98698413342.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba700c1f9---zuterelupugezexodidiben.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/30073e7be465d04f1dbbb6874f499869/bipalorakemabofakod.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/53248572615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=anatomie+appareil+g%C3%A9nital+f%C3%A9minin+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 18448 bytes
SHA-256: ab9aac7061cde0ba2f9bd1892e374bf61f56a661882d3e18a16ded809dddc2f8
font_01_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 10808 bytes
SHA-256: 720acc2a5eb4862833dce74a06a86548daf4b4238d968f678681ac8e7a8315f3
font_02_sfnt_off00013793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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