Malicious PDF — malware analysis report

Static analysis result for SHA-256 36656453521704af…

MALICIOUS

PDF

100.0 KB Created: 2021-07-16 07:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52688d30a0f8461e180cbea8dc995484 SHA-1: ff5ddd8fa0b74bbbdceb3c40c1a1b306c42960c5 SHA-256: 36656453521704af38fdef3687412957b266db837f6bb424c7453e8ccdccd39e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted from this sample, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://queure.ru/uplcv?utm_term=reading+answers+of+the+dollar+a+year+man PDF link annotation
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/19a99bd6c5af2ae8eefbf99e2557e76c/52314386029.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/vasawobemudiwigi.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ebsq0gs5hbfqoagc0fq9hg0m2d/buvazufevoduda.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32be0169a3---fijijarexeduxerowiv.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021060411365852.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/40044815407.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/zuxikajopum.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/8ebc1c11ba3002be94ffabf947b7f619/fivatekadopagedozeke.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/11523239204.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/64929669604.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/45323026387.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/488396eae5315adfc640cf4691a141e9/53162459038.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/43449aa134df7496f841ab1c8805f113/11407902634.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/74066501638.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa1689fb1---midemir.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdd3396c7---niwujomotum.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l7rhpdvkqr4c80ebtljor057p7/73292216496.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607735053dbfb---foguwumejamovizabozul.pdfIn PDF document text
    • http://aplus.to/userfiles/file/zajedexibekovivade.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d96412a442c80f0c0135bb25176e7b6e/gokijakubijesepavajo.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/bamimufuw.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/328d17eb52e6109e6e19d974de6c56c1/fuzirivogurusigite.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/6vej6jeju08bkk9b99eu913o15/4583754872.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_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 17908 bytes
SHA-256: f22a382508bab2607a6a08a41256a4eedb71a94b3ee16f0704bfaf5210b9538c
font_01_sfnt_off00014f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2D 11044 bytes
SHA-256: 040d32284349db38c8e83f3f8ac3e92e42fa1570a895cfb39d42d2d94a4e10d5
font_02_sfnt_off00016888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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