Malicious PDF — malware analysis report

Static analysis result for SHA-256 600210eb2729c052…

MALICIOUS

PDF

75.2 KB Created: 2021-06-26 12:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2f07fc41c71e2d3ce084e8b2095dc44e SHA-1: c1680330b19246dac523db58bc6be519c532f27d SHA-256: 600210eb2729c052fda2614d04c9a16b7048531ce2df55b552cae4971eeb31b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on compromised CMS uploads and disposable domains. The embedded URLs, such as http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9ee8503ba7cd800832e641f0dcce3cc5/33741011213.pdf, suggest an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01656c449---35427183256.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54d3b51ac---gigogavizozaxa.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdbb289a65---volipegovejexunij.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/15f76rr1n73rfvdc88fode60lq/53850140481.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/181353044639.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/milidigunedujixefibone.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/38987815820.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/1bfff39cba44dd33fe79cc55fc40837a/60483215181.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd590722d9---48622126047.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7911720c6adaa09df603035877703791/nusegusizasilidetujiwi.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/kijabuzokifunaminurem.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c423fd6f24---pokiburi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ind1hheps5qhugs00hg1tmu8l4/monusagus.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7d3c087c60115ba83ba44ebdadd16e69/tekepifonorubog.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/nemesenumo.pdfIn PDF document text
    • http://poiskvod.ru/images/file/bawewadurawaku.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/99707999601.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc203e268---mojigavejesovititelav.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9ee8503ba7cd800832e641f0dcce3cc5/33741011213.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/nosojojaloli.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/meleputuwosas.pdfIn PDF document text
    • http://brlairport.com/images/file/56422108648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=do+you+wanna+come+over+later+to+my+housePDF 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_off0000c4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C1 16352 bytes
SHA-256: 21f0077819b53f6debe79df7dcad1a56c4526dd0243e47b44834d24ea62d2655
font_01_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 10772 bytes
SHA-256: 8f4e358e51828618a855ac8da82b0b8b2ad65bb34f55a800e53adc50c9481ba7
font_02_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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