Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3f8e2c957e5b0b…

MALICIOUS

PDF

96.2 KB Created: 2021-07-15 22:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a55225e4db92d5b7f2bdc7bc48585c4 SHA-1: e6ba32ecb91b7a4d3a7c74f2399137c09dc0ca59 SHA-256: ba3f8e2c957e5b0baf4654939a36ee59fba375b195be537f2354f22c08af540d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is intended to lead users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/98aa7e86537b5048b0869b7491c319e9/defume.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/aaea3c3d5fd9c0856a65512ff190dc5c/59388531842.pdfIn PDF document text
    • http://santeh.md/img/files/zebedema.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/78365393837.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7apoanob0dvc99jdgn1bth952n/72187313958.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/watagejuwatewi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e9f8a9e81---gaxotezimopefebipamomuvot.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fccddb5359---dubafirebazexaxiwim.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160723c42e65f7---82610411822.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kizasadotumafuwizani.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/um6vnasevckroinb59qf66gvi1/15525760166.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/nigomajukiguxasaw.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd60f8a7048---26842175356.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/makunev.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/t592v782r75dh2qppv90oq6cj3/tupomakusepofevotale.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f9a0a268---kagibugidupizupe.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/nadikesor.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/nawotadewagoradokifowevo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc2f587f8---37310135519.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5bdabb10d6789aebd17f123db758ee76/88110644410.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831853612b---tamamiguvekivig.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zevone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=this+is+just+a+dream+shamelessPDF 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_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 16964 bytes
SHA-256: 2f7bcc719fe40a354bc96f29bc9120a57409ffb900e9eef71ae1d1e61e4933c6
font_01_sfnt_off000143e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFC 10480 bytes
SHA-256: bcf8de1ea56379d81903a8a1de12c60ec10f1fcf6db270856d67e5ba54cad4b4

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