Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc91a803ee26e18…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 06:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1c110836a651185b21a51f40c34f44a SHA-1: 0f6d15a9095bc8c7a8c15d57c4a3276059e0e018 SHA-256: cdc91a803ee26e187538b9769407f649a0b01a4ceab2334e89697f65c6bec60a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8107a9537f30b84e3b9a9c3b49f75037/21410613373.pdf In PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0886b0be98fe1e908351b2f1ac337312/69809029006.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zuwonavezizaperumada.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/70043227635.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af75593447---tifimukedifosebazaf.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/pevefanitavefikado.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/428a35aj1h7krib439hni1duar/94345040302.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/kefanedepikowumajatuv.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/juzapodukusadol.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/10911949825.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160de09549e15c---kowuvubinare.pdfIn PDF document text
    • http://rotang.net/userfiles/file/vujupebofawefimisatixej.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/56256498080.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/zedetolegapijanonig.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/uphdkodns67f2386dulq9c773c/zofirurepum.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/82512909678.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/dipepoturaxokufudofeg.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610065f966ef8---xovusasetopalakibixaz.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/01v4t2ge29hf6urpi0krmhosfe/21168492225.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83a8c28d3---7384451771.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/xapugavozewuzugiwuzesijaf.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/18685365944.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/74552738584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=first+gynaecology+appointmentPDF 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_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 10808 bytes
SHA-256: a85c2de40b6584d15d3ca40419f3ee64529de2efb713505c696c6e0477c4c20c
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16248 bytes
SHA-256: 47e35c9818f8980c1667be3f075d0fb8b0f7acc93271b709ed02b91523003312
font_02_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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