Malicious PDF — malware analysis report

Static analysis result for SHA-256 515463291db6c1b4…

MALICIOUS

PDF

89.9 KB Created: 2021-09-04 03:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 781995eaf011d2b5c9516fbb01a719a2 SHA-1: a7c1f0eba0247e42b15c05a70e6e7a89075c9b69 SHA-256: 515463291db6c1b41f66a1d6a5e478f2a6bd29d36b94d924aa0e692e7f22be84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the detection as a phishing trojan indicate an attempt to lure users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://crysiq.ru/uplcv?utm_term=diagnosis+of+traditional+chinese+medicine+pdf PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dce52a54de8---71303834807.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612628b5ecfa0---41334498906.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/83333286344.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/41217505450.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/supokukidibeno.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c557e3c77ec---30264808748.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083576e4680d---xusese.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/72221102828.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/7618572217.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/86584087199.pdfIn PDF document text
    • http://jarosi.hu/files/file/16946849072.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/30348743170.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/43f486080da80edd1c92c7f854fa4ab5/91041498328.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbe818c558---26581731974.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/gigetozelezoga.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8448119b3---suwozujise.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/c6vdurmmj3bv5gp7kggfd6irk5/134990762.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210705/03084269.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/xotoxabidipeb.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/87661245697.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/894597e0e9e1c329faaf5394066b4edc/91684339468.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/maxezezakodijozorotipu.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/53825255915.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/p1hd9psnh19bthndghbo3gfnbe/82996380746.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/fazisoxofusajekuluvi.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/56692825751.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_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 18248 bytes
SHA-256: 3e241154e4fc5855f0cee705097c4c6e8adbf335d3044fd00298102cfcd362e5
font_01_sfnt_off000127e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF8 11068 bytes
SHA-256: 6a0838e93e255c997682c5ad32a9422ceb4a481538d899035912f5bf3481858a

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