Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da62c2beb903912…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 20:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c74341e7ba8ec4dc1cc7bd25f8b9f7a SHA-1: b2fdaccb9875f5f779a332537667e5571807996c SHA-256: 8da62c2beb903912211868c81c3e4364ede8e28703160b6d26f0bbd98e9527d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support its role in a link-farming scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f07c35cc---51506451377.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/51a3966a504a39e368ccf06a47c68a82/79531449986.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9q64lagiu86lr6tq0336jdbgg9/viwolomaboleji.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d184b9a1b7---tefajefafibalevimudek.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/660ecabcd8f2bfe883d6d0c4763baef2/funevotugabijegu.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/zitivagazexevowavugaxo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b9b2dc9c---mefotozevi.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/94758296617.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/5852024623.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/gejubobu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bc7feee61---doravinuzagaduvi.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/63787441022.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14cc78b41---zufuxafugi.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/59468604474.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/2513669543.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210618041649_epogov.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a71e5511aea---sejulijemijawoxu.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/88061352646.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd9rfqp7p1knc28s90j169q9qd/32782670898.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/35156104775.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607596a5a0473---nikuzezixilazawe.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/u9on5c7d1fd2ijdrnnqu4o9a97/dosoderiroramufora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=large+scale+c%2B%2B+software+design+pdf+githubPDF 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_off0000c75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 11180 bytes
SHA-256: f5ce9d7994a5b4f9325c35461b1f73f47fd8816f9355d3140b9da4842e2a2bf6
font_01_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 17048 bytes
SHA-256: dda344525fb20a71bb975127b3a7657faa200a7c3304ea4207a30a2448007836
font_02_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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