Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e433ebeb1449be…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 21:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b5aad572a897a5e8f0aa17be2f92d66 SHA-1: 219699f9cec6b7b477377186e4c32a5c15f3cb85 SHA-256: 61e433ebeb1449be11d4e04d754df04dec81082a2ad84101768da7bf10612790
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Numerous heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a phishing trojan strongly imply a malicious intent to compromise users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=the+conduct+of+life+pdf PDF link annotation
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610397bedd8c9---gilufometokasufumenega.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/83bb2e0acfa18ea98ce0c5fcaeb2e86e/27871612862.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/95803471758.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608361184bf07---zaxadin.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6b0c1b12---lukakebafavolutitewojito.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/77ec3ae61b8aa984b35f5e95dd4f836a/sodorisa.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/c0p41cv3blc1cec3k7ghe22avc/12091322091.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/78021214475.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/87889926568.pdfIn PDF document text
    • http://artside.org/data/temp/file/84097830019.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/5334534062.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609852513317e---48186135163.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/logosofa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a61722099---8628925488.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d62e13727---lagiwivazetaxonolaxujusep.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3c24a622f633fd93ae5bbd7969d8af6a/mizipeneje.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/19415656547.pdfIn PDF document text
    • http://fitviewer.de/files/file/61696211528.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/gizep.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/6025ca57c97c32e4b4ced545e1eae100/33448389715.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4b2bjufeitmf5o67vhmmvp8mq5/85578679656.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3ce194efd---munab.pdfIn PDF document text
    • http://allasclub.com/campannas/file/niluzebefexajitotudeku.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_off0000bb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB98 15244 bytes
SHA-256: 93d1e42fbf20410be7742297650d36b1d18397c3e87bc7e4f13490eeb762fa82
font_01_sfnt_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10348 bytes
SHA-256: 50124fbd9ea20b9a22f84ec792282336f997596ac5879dfbdb9c7d6577e60f6a
font_02_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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