Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ebd179648277c2…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 16:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66931d458278725e7083391f24be93d8 SHA-1: b64f7d16feb57e1e85f4692f980f270f85ffbc42 SHA-256: f8ebd179648277c27e39565a37183c77d62fced469beae0ea922151afdee2b55
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/430c328fc690d4217c9e76252a3112da/29939837708.pdf
    • http://lightofislamonair.org/uploads/files/73224017555.pdf
    • http://ackerviewguesthouse.com/userfiles/file/84910361022.pdf
    • https://megatekspb.ru/sites/default/files/uploads/42123037800.pdf
    • https://shunnasato.com/palimexixaporuxuwudiperis.pdf
    • http://bon-mar.com/fck_user_files/file/bagizurorexadufifud.pdf
    • http://westernmaki.com/uploads/files/9694304975.pdf
    • http://spalovnachemolak.sk/userfiles/file/numosimereted.pdf
    • http://proart.by/media/file/22881022725.pdf
    • http://dream-mebel.com/pic/file/27013463772.pdf
    • http://immobiliareborghi.com/userfiles/files/nojokoj.pdf
    • https://loyd.rs/images/file/86848493826.pdf
    • http://sushistoryus.com/uploads/files/pugarozagumupi.pdf
    • http://bandenplaats.nl/cmsimages/file/dosojazadisedaxibobudivu.pdf
    • https://7mark3t2-7aya.com/contents/files/zozokusodexijuxodawupotu.pdf
    • http://suachuaspa.com/upload/images-content/files/jedavutizobudiw.pdf
    • https://smg.bid/ckfinder_userfiles/files/15550554212.pdf
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/dobaripebuzad.pdf
    • http://mim2010.ru/userfiles/file/88513138293.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614487159de89---vubejofepobepazigetuso.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c013c072---3567866715.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/buwudubaka.pdf
    • https://cleaner.pl/userfiles/file/bisavam.pdf
    • http://abwnickersonplaza.com/uploads/files/nojas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=matilda+full+story+book+pdf
    • 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_off0000df5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 16792 bytes
font_01_sfnt_off0000f770.bin
d8b7b1306d5608f7cb8a0d9722a2ad328203886e35019774d4a40a509991d7a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 18448 bytes
font_02_sfnt_off0001275b.bin
6f8531b40a88fba0d82b8747bd1b666e5ddfc4c02b8cdb7aff8b80ddc5eb666e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 10692 bytes

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