Malicious PDF — malware analysis report

Static analysis result for SHA-256 0837f8c93293c9ec…

MALICIOUS

PDF

94.8 KB Created: 2021-09-02 21:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e37c765a59d5ba274b8de1caba6fc5ed SHA-1: c8291545367023afd4f9ad875713d305d6e72822 SHA-256: 0837f8c93293c9ecc1bb386a6e5baedeefaef43fb03918bade6ed52be65035e0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pixomot.ru/uplcv?utm_term=superstructure+of+bridge+pdf PDF link annotation
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609c80a6eb6ab---52398109200.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/86441264996.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/bewali.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b38974691bb---nadewavabanowosip.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/palizuwesixogi.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/33941886475.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3b98bc7574ce853ae2de53ed6a110b6/texive.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/63340572243.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/fa7a078b82a85e9d4cd13480c080a7f7/29322825657.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/pupimedilap.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/44516587903.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/81887394771.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/rebozopomodalogerus.pdfIn PDF document text
    • http://bscartridge.com/pic/regolad.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/fodibavorufikiwomogotudaz.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf21bba74---fowaruzejekevuparoxaso.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb5cad653f---tuwilu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/17842871268.pdfIn PDF document text
    • https://eniedu.com/data/file/20210801210247.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/10055482398.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/860e45b6da49426b2d6ad82c165de842/pibaj.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092c42037995---49173010906.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/1vctduv2kqgdsvdtgid1sdeqp5/16266800169.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/wajexedevepipijefe.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_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 10800 bytes
SHA-256: 4d7d143811da888c7f712d2e84fe53d3653492da34d6488f44e4996920333b9b
font_02_sfnt_off00013d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5D 18604 bytes
SHA-256: 0985a2115825461a314d2007e078f02b0deb788e5373c449021d287f8c40087e

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