Malicious PDF — malware analysis report

Static analysis result for SHA-256 8693b120214a654c…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 14:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c92453eb7b002203468c7c3b855c587c SHA-1: 9e13cfe73f010887a6065b43023d4c19d2083455 SHA-256: 8693b120214a654c3c5b1c8732783c112bfc597e1532b68b9e7e22f9bbdaafe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=ironia+y+mayeutica+en+el+metodo+socratico+pdf PDF link annotation
    • http://baaningdoi.com/file_media/file_image/file/warit.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f254fe2848c---38247866367.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/55864839096.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/6793689587.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/33670773245.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/juzoregezoraji.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/legemobinosokuk.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a40192656ea6613b07b198cb2dfe7857/73387645426.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/golabobanami.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a1e5de412---dajukovunaxoniduxi.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/82103705382.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/4b60c5abf13936292268f30f6b6fe487/wukomukavukunibariwal.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102e52ddb839---37353461452.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/83423011352.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9525b362edfd7730bda97e5fedb11e9c/82492675145.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/vozafix.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/77849695503.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/16352451198.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/51492675290.pdfIn PDF document text
    • http://abnicum.com/files/file/nejowoxomuja.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3bf97747---mazopekewebefelalosureser.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/77805638531.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/76695173629.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609174e7bf96e---4784867765.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/53567699546.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_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 10944 bytes
SHA-256: a0411ded04a42c09dca10a7cf51e49014636309060d1ea627b99a1ee4e704152
font_02_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 19944 bytes
SHA-256: 646c6b37c750eb721f050218ee30d78e942fc5489e2e2252a587cc608538fc7b

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