Malicious PDF — malware analysis report

Static analysis result for SHA-256 159787e0788e9f90…

MALICIOUS

PDF

90.2 KB Created: 2021-07-03 08:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8fc36c88616d268d2e91af71e08debe SHA-1: cde003587dae8d1f6ac23c5c09cd8c925c63c842 SHA-256: 159787e0788e9f90bd5b386b504c93f303d65e511c69d20270828916983fbf4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on compromised CMS uploads. Embedded JavaScript streams suggest potential for further malicious actions, such as downloading additional payloads. The numerous external URLs, many hosted on potentially disposable domains or compromised sites, reinforce the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ggoikm24nghia6r322asc45n9j/tunaxasonibavubi.pdf In PDF document text
    • http://narcisse.sk/editor_uploads/files/dodunevizefugexivogatu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7da54ff6e---10511888531.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab079c974ad---26716382433.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a2ae2dad284fb92e8d81e6025d608b0d/duvabumejemajibitubewa.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/komomos.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc297f8cb---6477172412.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/12588016323.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210625214353_773020814.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/sevebesijesu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdf067b560---milevap.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7c230d14d4cc110356735e620c532390/forufifagimilelozekewup.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cac7117f8aa56a94eec74ef3b4b79c79/75559938838.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af4d1d9a7e---weguva.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/rkpbul5shctq9umnfp0bne40cb/31789646658.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xigasolosawa.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/jenoxifakodixotex.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b56ebdaa7a0---bufesabajojowup.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/cd5fdc950eb40fbd3a9e0ee99de2773b/gosav.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/pulawigenopixozovugavavos.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/ragewezu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a55b6b062---dubevejoweda.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/787e975cd1b8d7ddc844d1e159341ea0/kapowegepuresepejep.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/3abc41f57396006018fd001b78474ca7/83414783736.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/tugefazujuximoz.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b071721d3---22231523188.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/6936700169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=father+daughter+dance+songs+not+sappyPDF 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_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 16608 bytes
SHA-256: 5e4e1f72b20a418fbd6dbe761a1bd12d9094ad6c5dee3a0282c7167a6c2204a8
font_01_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 10844 bytes
SHA-256: ba97e54f923325c6e511d6c8a79c31f1a58c0c1cc82f3d10403c7f85f960aa6e
font_02_sfnt_off000142e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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