Malicious PDF — malware analysis report

Static analysis result for SHA-256 21367d229c8cde33…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 18:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a71131f587c3bb0d675fca63e3e2ed1b SHA-1: 3b9898db4b319fb3a01983eafbedccce0fe0dd81 SHA-256: 21367d229c8cde336bc666957f6b4ee93e31718c045b9ed66b5a800b2a2d5070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many of which point to compromised WordPress upload storage or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or direct them to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://123podkrovie.sk/editor_uploads/files/ziwejiximisuxufesu.pdf In PDF document text
    • http://studiofapas.it/userfiles/files/linopiwaja.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/75672608419.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/xozagukejokupotijixepuv.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/af8ed37vl7kmef3g04lc92sjd2/pasunodomon.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc702bb8e---84520575669.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/65565599195.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/rofazobi.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/mipuleribijazanunejaze.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3723846c78cbfaa394b781d9771295b8/17367437189.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/268bc5b9d2c94aed8aadedd8f3e34493/68678913843.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161092b4be4100---vabevifeliraxotik.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7qco0ud1afjob2609mdad08m41/sajinutepuroxirenupejuduk.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/fs0hjuauemj8jr6beak0j8lnos/mikopukodimisujeser.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/lubevuse.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/88327261405.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/mojawebigumuzetol.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/78733126102.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/10f35833220e5fe9de123afb2e3dd3b2/21887824349.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/chm9er2752od116kui57hjckgf/ziwiji.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609408eb99f5d---29080282761.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/81277338002.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/pizafovajokewuzumaforirul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=2013+subaru+outback+2.5i+owners+manualPDF 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_off0000b803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB803 11376 bytes
SHA-256: 7384e4f8048c62f62b8ca7d5493af2e4c2f9eda73ce1bab0bf476bffd72516f5
font_01_sfnt_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 16300 bytes
SHA-256: 21fc72a891747ba215e45f0457b90fdb817f074d81b8240621d3375d31710440
font_02_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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