Malicious PDF — malware analysis report

Static analysis result for SHA-256 e275755693c3ee8a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 01:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc7e180c92563393806a83de35d62608 SHA-1: 542841171f728296d8036ed6c0c4c34db1ce553a SHA-256: e275755693c3ee8aa078e94648afd57f46e722552e92e5687ce421350b297350
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=oster+blender+and+food+processor+manual PDF link annotation
    • https://ferropula.hr/files/60378016248.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/36488639813.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/601vdfoojdcvllqbth8id2ampm/busuzawajexoralefe.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42460c0e5---53101888610.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/9b5022e8c18b9616729ca439f4c5c43a/33080936827.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/242e4aulvtti90jeb7ru29j13l/48313215994.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6r91fu69q5njnaohjqfknn7844/zisuwatimabitijetodel.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/230b83baa9224c7487b4f81c49a88106/fugevibukoriragefavedav.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c90810c5b---nikitowog.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/450ce632fc0ee34632b7aecb95c9c265/13946995290.pdfIn PDF document text
    • https://mytopics.it/uploads/file/luxopozaxirorobovibasadi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7ced0f9f6---mubulepodesojefam.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2332aaca04b7669fe5492b342a392cf2/jojejupabini.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa0721a51---nipazolarukub.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/sezabomud.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a680a956f7a---pedotulezigavexosodisoxe.pdfIn PDF document text
    • http://smartmedia.ro/app/webroot/files/userfiles/files/zijunebekag.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/lj3gepum6oblrcs28anovbj9nb/mipinowikakuli.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/24981952658.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/39806690598.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/qralt98v0gkpvuqtmjicm9magf/boxamexilidefevopiwef.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f8d75a2fd---5988851278.pdfIn PDF document text
    • http://saydersan.com/firma/files/38620549187.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/2h0iq0k5k01heiuueha8b2mfj4/gufabu.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_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 18072 bytes
SHA-256: ab936f0347450fc32ef1aa389844f448385ff0fa6f5d7bc5db236760bde0dde8
font_01_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 10956 bytes
SHA-256: dbbaa4844d036f6cee9574d52ae7c0685c046a97e7ff5751a9fa54889068bee4

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