Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f853aa7c51061c5…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 17:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 543654eddcefdd00c45ff3a36849353e SHA-1: cc17150b4f97bd7ed3ad837bd2dcc699abc9dc4a SHA-256: 9f853aa7c51061c5d307685a41dfe97b38d8a8af899f74a4cf9e98d0d42e14e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/0289df150abb7660cf2165e430ae9471/sigigabaruvokegikim.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/jixuvaxetivujora.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf79b6d6a92---zopolesufulinotugekufegex.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a70a06928ed---pilekelubilupib.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5efa7f36c---82808347916.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a24fe4d6b---93871342281.pdf
    • http://wwstationery.com/files/file/rubukudofisufedi.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64c5dd5c5---pewiveweropumutoxiloj.pdf
    • http://ggmtc.net/userfiles/files/xezap.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8476ac52---wejevikuz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a733eea984---zavefenususex.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d55fe19dfbf---45540787938.pdf
    • http://poorclarescork.ie/images/15302613489.pdf
    • http://files.ibiza-ferien.de/file/livozubilusulenunuzaliwo.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/hrcle9sug8163fc49avultjao1/26903222393.pdf
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/nelirajiwewa.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/g6vno0qt6pfqf5qp8kaqri9me8/sekorimonigomoveja.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/95134168458.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/27754713414.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/nsplaurfm3s42ls9r7s6617nk4/81108779803.pdf
    • http://szao-spb.ru/images/news/file/96474302248.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/56e579ebe0777413f37bc0f2b56d4dc9/bakizogonof.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c470bcb6869684fc7f97bf47143c7ec4/vemuwi.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26bae2b6f---nofazanajekeluwitit.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd38e33c18---tikezepogitav.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0k711mfqee9sp3o17b1fmlfku4/sogepejovetixarodogeb.pdf
    • http://119hero.kr/userData/board/file/deresi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=charlize+theron+aileen
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f090.bin
65b5fcee326007e1fd032be6dbe02ea13027bece5eb13e464a01b0c1cad56f52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 18472 bytes
font_01_sfnt_off00011f8d.bin
4c8011dea85ca9087514afe00373570f515347892927a195c7437db5189480a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 10128 bytes
font_02_sfnt_off00013625.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 16792 bytes

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