Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a504b781fcb777…

MALICIOUS

PDF

101.6 KB Created: 2021-06-28 02:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d9b613de1818a0afe16dc9192473ad10 SHA-1: 3923a7f9540e3494a6557d79b14021e3452e1f2d SHA-256: a2a504b781fcb77717091ed872f8fbf886747ae2c99d237853fa20f5e1e526e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96f23aa1c---bubaniwo.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbeb87f6db---83349980126.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/voguwewofije.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/768c35ea10f5d07b97b379513029803c/xaditusabegiwugagefiza.pdfIn PDF document text
    • http://skupka23.ru/upload/m/xasisufalesutadavi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087aff31bd80---nowitiviz.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/22817984660.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210606_F9672622583BA224.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/bcb919okrmb6db7ubelu1oo65k/26570702589.pdfIn PDF document text
    • http://envigest.cz/upload/file/liboz.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f477f6c979---79555179178.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/fimusojizuminalureput.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f83e99197---wozokisukazago.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4d74ef9b---gafavaxajiriwabupijur.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7f45fe48266f4447b284863acfc33e22/wuzubavivow.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/99qreqv7cfm0lomu2rfmfqrt3s/9298094490.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/cc7d38da8e71634bfaeb601fbbb2a9d7/48683403059.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/307c3ee875b691e89b0b20fec9c3f6de/kakuruwub.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/615caae1001f2fe7e91a0e24fd2ece9d/nibuw.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/luxoredelepawepot.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c405071a0c9---99178885911.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/wapokemogasikidag.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/e2e5e4f9f196d582fc515fa4aeb419b9/53656759081.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/699419c0f1805e3e824f9723615d036a/44200937924.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bb6109ab901cedeac2e594fe89567ab4/16421347977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+play+eden+last+shelterPDF 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_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 18916 bytes
SHA-256: d042cfa3ed90945ab5f60ac586dc3a4dff88c635707c27cf67b29299bd76f869
font_01_sfnt_off000158ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17116 10588 bytes
SHA-256: b7f9c8c67f09899c1698156ac566ace88e7a8e21d46973e04e7c73b0fd8ac072