Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef25b8b720ca017…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 09:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd9ca632aa528eeb7c294623c17a3094 SHA-1: 849c4e9ad2854b37c65b1f776e0c28f40cc8b9cf SHA-256: eef25b8b720ca017e95ad569d9c6aae6a18053ccd98042c1027e7a2fa6a1f335
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload storage. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://accomplishtheimpossible.com/userfiles_ati/file/97347094421.pdf
    • http://golden-candies.ru/webroot/files/files/xofaleredorekiponigi.pdf
    • https://seeandhearbetter.ie/img/shop//contents/vakavunoxebe.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3715ff3493---89988465052.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b9999ef6b---5348153830.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/j65e3crommua52mi8k6h83en2a/kutojokider.pdf
    • https://karinbentum.nl/uploads/file/68460819406.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/80851145113.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160754d29c19d3---vojimujojowamukobep.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/5789991a09b571296499c1c0c62fd1df/51967652923.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596066e20b---57623277550.pdf
    • http://pinturasoltra.com/images/slider/files/lexutew.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3d30623115557487c48bd393cc42a2ab/niwex.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e678343403f27c510c535057a3159444/viriwinominobiladiguxajon.pdf
    • https://murtenhof.ch/userfiles/files/43824159722.pdf
    • https://a2designbg.com/userfiles/file/70300937560.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f5d80bc2c2daa1232730bd54f85537bd/44766569940.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/cf117a061b4330dbed77bd13375caf9c/5969812659.pdf
    • https://grupahatak.pl/admin/_fck_files/file/95948190333.pdf
    • https://vildmarksjagt.dk/userfiles/file/wekikejewijimiw.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/kixesupulumokudawefilabub.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4lvsa5kdt3rjeu8u809j4ll1ai/96231626266.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/64898609306.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1028374a0---juxexuku.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee28e08add---robasirofor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=most+consumed+drink
    • 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_off0000e741.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 16792 bytes
font_01_sfnt_off0000ff58.bin
672ca7765b2b12dbc83e80cbfb2d4558a58b85edaf445be358b7153314097875
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 10508 bytes
font_02_sfnt_off0001173b.bin
af5d1c236eb16ecad380c341e526e861f9de6ff7f7096409d867c07f315182b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1173B 17380 bytes