Malicious PDF — malware analysis report

Static analysis result for SHA-256 59635af9f89b32e9…

MALICIOUS

PDF

86.0 KB Created: 2021-07-19 05:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aad12ab90157a8a52a37fb3a675e9589 SHA-1: 4f9ef4e750b1bd30979689ca8cff675d4d036b8b SHA-256: 59635af9f89b32e9c9ec9e183c627068c12a9dfb175837daea470b42ad0dd007
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The primary purpose appears to be redirecting users through a series of links, likely to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3e4a7faba9ae5a3ffd081d121a9f3db8/861657540.pdf In PDF document text
    • https://biothiennam.com/media/ftp/file/raderowisetazomirusikifit.pdfIn PDF document text
    • https://subarini.ro/mm/file/18292425544.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/94ee25c306822cc9280cf0fd2ddf5393/zatanasasurabozafi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/blceuufbke64mfh2luq6qdb981/31433325669.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/nupowovuxugipinuted.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210625025615_x0878w.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef5a7792d---78687446620.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/kubita.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/cb889605a3e2c0b44125c8fa0e909ae3/ruxugepenubemud.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/kironadawarexujoreg.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210626105231.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/an7gk6gcq7bicog2o7tcsd86sh/vagakadijewopes.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/53535847269.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f1c6c537---5472261732.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/sagowinas.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e3610e5d---vumef.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5a2c47c0---25915775621.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/580888601.pdfIn PDF document text
    • https://scriptdd.com/_file/file/36169077052.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/34032736296.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875924ec2ff---14419793528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=let+me+see+you+get+low+you+scared+you+scaredPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e7a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7A8 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000cf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 20604 bytes
SHA-256: f877ac8b8fb667e47e81bc74581137c7aeaba35a7fa81f8f6480d1a87134bb6e
font_03_sfnt_off00013125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13125 10772 bytes
SHA-256: 00c7ebfb60e99f8863ce0893a30dec270c1e1824c3c16eb7aeb44b774945020d

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