Malicious PDF — malware analysis report

Static analysis result for SHA-256 9711f6579cd4feed…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 16:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 808d15bd861e2eaf4501df785d36a203 SHA-1: 991703549dd880c8c2100c52ea0b08f69bfa775e SHA-256: 9711f6579cd4feede1d172d0ec8bb4649e921aed41d07cda4dee40a2618b792c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of embedded URLs and link farms suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf32c741bd---neberimikided.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e37263eae---rulupupive.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/90270056623.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/88326113702.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609133c98cce2---86411965479.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/kuserove.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/59278903925.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/pumidogevulakedoximimeg.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/401e9503ccac676d60c37ad179ed505a/bovogodewelunu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/093cb67923cc9e8b863ce020a49c0879/30885160737.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/bafewezovutosuvujegov.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/5e3903c69377018f6e01cf2af0bac475/34048702680.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/38960804408.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c9c1c421---butopinezuzokuguguni.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/54231313402.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/89143975116.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ccaa140ce---zozibana.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/81185088681.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/804f7ea77ef93e25814a02c8a80f9cc0/giwapada.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/p1l7b8msl1rf7s08shspitt0ln/20016599693.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/35743599379.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/inpn3m9f4cr6hiear2553orbr6/rufigukikudifulinuxunefe.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd2e797c9---13796465723.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f2406a384---pitorokipot.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160723c024643e---dividisanex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=que+es+el+manual+de+marcaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 18784 bytes
SHA-256: 1a64b37ecac5610c5e844464aac8e9ea8edf273b0b2d6687cb8c3cd6ce880475
font_01_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 10380 bytes
SHA-256: 5464ed077de252774007e5ffe934bbed7030c665dfda92ab3cc902e026f7dd28
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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