Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed56bcdacdab0dd…

MALICIOUS

PDF

82.6 KB Created: 2021-08-23 13:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e13208f83c4007dc5b63b3a989b6de1c SHA-1: e1a53d09baebe7785fdacbeb386053d89ef2ecf2 SHA-256: 3ed56bcdacdab0dd0144f272cfd149bad89d619967b4f9536efe2e62d646c11c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=how+to+convert+img+file+to+pdf PDF link annotation
    • http://maility.pl_adresuserfiles/file/woropufafizarekibefot.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8fe0ff0b---59724298281.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/degijanuparodam.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/90098095990.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4805a8e4b5bf1685a5b7aceaf1413c52/fazeluvak.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba7db03258---basajiwowofidodimowisaz.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e5d78126c3f83929c72bba4791afb52b/nadatumejelowabedisanunub.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/fodawuzekojudob.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/vujavidamo.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/19102739376.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/49373215210.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/fonaxutob.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1fb68cff---64563860999.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/watijexedeziki.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071042a338f6---68264181759.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/u9rdr96nqm42v4mk3bcuhtiopd/46234941930.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/vanigukijeni.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/52196934669.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/pidudatejene.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/gabepasedorapej.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/25798559516.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3ec3b37e---63205119525.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/88025211148.pdfIn PDF document text
    • 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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 17056 bytes
SHA-256: ce969ecd5895d28f491f60d62fcaf42878f04b0f32ea69b5a7f3795145746ba7
font_01_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 10776 bytes
SHA-256: 46497f061d49cc9991d783f5dd7942ab8cfaa629be1947d0f02c4390a475da8d
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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