Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c9286ea0c26385…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 07:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b85edd8aee27689e366e1621cee25b4a SHA-1: f5bb71f6b7f50f3cd087e044385fe148ee5c44bd SHA-256: 41c9286ea0c263855c0e6c574aaf223b757d88f0427da487d3863ac41d0649b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It functions as a link farm, distributing links to numerous compromised websites, likely to facilitate phishing attacks or malware downloads. The presence of many distinct hosts and disposable hosting patterns suggests an effort to evade detection and maintain a broad attack surface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wastran.ru/uplcv?utm_term=wow+3.3+5+affliction+warlock+pvp PDF link annotation
    • https://cordovajewelry.com/images/file/95280203669.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/a352a193e296be9578e021b1cbce7387/51857723812.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021081415443173499.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfb16b642---15934171985.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jagijovuroporuv.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160778c6628949---nobuzupopifetetuxemajefa.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3c4e9d6d88c7f904e2738e96b05469b8/42352977563.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce2f80b64e---76615987545.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/64870905972.pdfIn PDF document text
    • http://cpils.com/userfiles/file/vuzupopafowunu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aef97370eda---poxujepivixebak.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161162bc186404---64647030548.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/70657911322.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/32801801635.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/dokini.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5764f933---51199966147.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120bc9709603---ruxon.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd9e29be3---xokupizojezixiwonegu.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/wovakejat.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/76603798845.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/pomir.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bffde5359---vunupene.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_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 10780 bytes
SHA-256: b556b74cc42580fb5db3a6942112b6e413caf6a37b3ffae16d5b18375b00193d
font_02_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 21200 bytes
SHA-256: a7a492e878f153f13c8ffaaf3dfe2746f110bd768db6eba7a2c13a43c5881916

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