Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f5803b508d91f4…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 08:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcd9b6287484aa49eca7a0b931577ec6 SHA-1: f2811cd6f7de5e1b30bdb1b3fcda7432117ed300 SHA-256: 07f5803b508d91f42b9c9e64b2b0f77955fbae7c1126155767912e971e5f4398
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=night+mode+extension PDF link annotation
    • https://gibidesign.com/fckfiles/file/34273226593.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/guzikagizukapazo.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/47368753782.pdfIn PDF document text
    • http://partnercable.com/files/84463016017.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/vewovavadowumoledevazu.pdfIn PDF document text
    • https://lordoptika.hu/files/files/sufofusirit.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/559f0e3b3546f87d9a4eb2377f94e256/ximurabinuragenogolo.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/mokesuvupadojisemibefej.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f579aa3d6a---9493478185.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/37850961364.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pgp0m1rmd0c5b62lftl6io48lr/lifikidupulapazeg.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/43846069165.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/jurozovipimudexowekuvu.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/lagotuko.pdfIn PDF document text
    • https://purefeeling8.com/data/file/18580437595.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/46993633252.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/tapematuxabewowugaxirij.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/25152363678.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/66714899920.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329868c39c8---19657732653.pdfIn PDF document text
    • https://bor-diing.com/upload/files/taluvagojekixi.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/fimuzemevodudenejitujepe.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/xabojaga.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/viluji.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/87585434667.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613589d4be029---48394521672.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_off0000c5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A4 10468 bytes
SHA-256: 6a9a9a5167b8f0b08944daa5b7eb29e122d9bf90cf945994221e9651145a0463
font_01_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16560 bytes
SHA-256: 96cb438c9ae5065c835e084bef2d0fcbca640508b7d5dc9c1e9ec23f72eee934
font_02_sfnt_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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