Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a12f5128d94928…

MALICIOUS

PDF

99.7 KB Created: 2021-07-16 23:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df3885ae18def6055d8ef5f141ed2c9a SHA-1: 0b056dca7d05ab60ca310014a9f6501fc09cb26d SHA-256: e3a12f5128d9492896ce53f0c399aaacf41f00da677fe7325df0216b6718930f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous URLs on compromised CMS uploads and disposable hosting. These links likely lead to phishing sites or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bacae91ef17---53543896546.pdf In PDF document text
    • https://nadinerogger.ch/userfiles/files/zesoxajoge.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/41351715687.pdfIn PDF document text
    • http://www.grifin.sk/files/difozez.pdfIn PDF document text
    • https://protrialse.eu/files/files/63690313215.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/5713419189.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609054fb1af35---garogobodekofometa.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///lapakukerebugo.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/f8511ca73764c894ea69ac8e66b28f35/wapawetefen.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070962268340---56911831261.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e21c835b38d1a0dfed8f83cd0d032156/66971668286.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/88099377993.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/wurinumezagefenobarirob.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/o29a5jcdgi2b7ofodvqlh5kjv3/vokinojujefitidorajalix.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/48860090477.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/fujedajitawekeg.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160792d3c6ed7b---kopogekupofaw.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/553avg6n655o1qoas9b7ksq3n3/4656850761.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/90630517170.pdfIn PDF document text
    • https://ive-cal.it/file/jemijofemuwopidedukin.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e845f5e48d7---96696267248.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5d6052192818848f530996b436fc89c3/baniratog.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/buzalove.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d3c8ad39632965f8b9dbc3b9e5db08b/vazexasofaxowojasox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=newton%27s+law+of+motion+problems+with+solutionsPDF 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_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 17100 bytes
SHA-256: 0812c3e123a19d0c6c1160dcacb2efc2d7fa56733ff6d3deda6acca33cde302b
font_02_sfnt_off0001680b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1680B 10960 bytes
SHA-256: 2f0c54a3114f329ef6e1767b26a76bea5b8b85a8da43605c010efafe85e021d0