Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b222b9bebce4cc…

MALICIOUS

PDF

84.4 KB Created: 2021-08-05 05:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f6975c333b9974e6dc7e042c07dac01 SHA-1: 2f4dda1c516dff0a3df7e4d95c08867debcd77c6 SHA-256: f3b222b9bebce4cc00fbda79d16a470dad7ebcd53b3559b8a6ba00b15b73bc23
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers also indicated maliciousness. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised websites. These links are likely intended to lure users into visiting malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16105b2cc3a08e---xezatipesugiwag.pdf In PDF document text
    • http://avanti-kuhni.ru/upload/files/xevis.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c88eb1a9517---wururu.pdfIn PDF document text
    • https://cape-electronics.com/media/file/terovuvowupobiti.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3b350a5e---75014022564.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/weliwep.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/80864103287.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f59448a67---32921660665.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/1501992741.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/tinudekokupobuxokejamus.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/finezosig.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/17b6186475e203828fa1df679083f3e0/titojasarutumurabemaz.pdfIn PDF document text
    • http://ecole.ru/text/images/file/35323414117.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/fe61d995a9780f337a8ec1e36886f4a5/mevubavakoforato.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/12855270881.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/46811860673.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jadvb365k1t7aioeu7vp77rjk7/nomagagibedasusorupalim.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/26139100933.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/17663352063.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/87cee581b9c7446fa53476cad875a956/27003945596.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895aff513b3---37900918167.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/telawezokoxopup.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16087d83812663---bigizewezoweberojuziju.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/10030976272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+treat+leukocytosisPDF 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_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 10504 bytes
SHA-256: 344533620738e0ddef31b9bd86b1f63693fba62c7c1260f9428cd971cdb8fc9c
font_02_sfnt_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 16400 bytes
SHA-256: 9ec085b393dcf72c50a17c50e0b4a0722d193640aeca56133df6c7e15a52d534

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