Malicious PDF — malware analysis report

Static analysis result for SHA-256 5859cf000fe636eb…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 01:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d3bb690d01ec0eb3d83422b2e32f9cc SHA-1: 8da296ae71a6b3241d366996d605fa411af42fdf SHA-256: 5859cf000fe636eb924051af5597099c738cca154ebca8dcc8c0b4a0b1b701a9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple suspicious URLs supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://meble-tk.pl/userfiles/file/91402185863.pdf In PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/3620346214.pdfIn PDF document text
    • http://linza-market.ru/upload/files/tegasavosuw.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210909055003.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/fufokik.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/bibinupirupimonowifo.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/maripaguterevizotudez.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ae56d2a6695c8890b6d1fe6e7272a55e/13145921006.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/20494008b857baf3f41b549d43e316ac/5169741338.pdfIn PDF document text
    • https://digireg.es/upload/vasojajoxabematowifos.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/dakivalinerefulotojiv.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/fuzerisobub.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/faxawagegododivag.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/gubavixaxinikewadosoje.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/gemawininabovemulavokefum.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/baa7884edabf0a2bc30bc0d70ab8b093/tonamipivefesituran.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359a209ad49---tinoraxokebaw.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/wujowukexejafonemabegibu.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/rategagidemodibesezefu.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210906082214.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/95217392940.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f577a38a---lujunavujobepizofuwe.pdfIn PDF document text
    • http://goref.ru/files/file/76840639042.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/68691855734.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/bixara.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/54a0a5c72a2e58c21c4d42a86053e01e/27271749203.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/98649706249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=homerun+battle+mod+apkPDF 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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 19436 bytes
SHA-256: f1c6110a322af49e4da38c80f72b15f9d7e8831698dc83f295dd5054a2581d3f
font_02_sfnt_off000126d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 10616 bytes
SHA-256: 84f44ac0ff2d4db81280a17afa98df6ef8d4b1e3e510146590c202feba910aae

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