Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6d4846a7a6649c…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 15:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a54c811f09362272f966f0f2aad0b01 SHA-1: 63ad96d090e407790988d670ff15d38636fb02e3 SHA-256: 0c6d4846a7a6649c8420cb3f80254b66cb66a6b093ebea04d5ed430c2867f9d3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to potentially compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier strongly indicated maliciousness, suggesting the document is designed to lure users to malicious content or exploit vulnerabilities through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • 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://www.alexgis.com/siteuploads/editorimg/file/xutokugaxisebakuti.pdf In PDF document text
    • https://hanahana.vn/media/ftp/file/duvafakewutepax.pdfIn PDF document text
    • http://zzweien.com/d/files/33290098561.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/c628tfr3978p96459dtbpgk7uc/roxadunogepakosupipilus.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/tilezimoxiwixololodu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-22/20210522164400761564.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/70387380744.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/xaxilagam.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/84909466030.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/f7jgt12qgm8e653r444nqm04jr/botawiwexiwiledofugikigi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/toxutukepudopu.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/kinisuxakapegukipotakod.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0ec49219f64d397b7b57236dbd0754e9/guvopezejivokajuniwoluzem.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/jakovezeja.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/mujujibuxamunat.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba11880fb9---lajexos.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835d62c2423---daguvuxujutus.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/lonovemotorapenubixovuz.pdfIn PDF document text
    • http://ipceurope.com/assets/file/dumaluvejutak.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/jegupikokuzupodapunutazix.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/gavizotawopugisoj.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/65457469938.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec089ec6e---50745923592.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8a7cb81af35399dadd684801a60c58f0/53303204683.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/hq1vejru1cbqrp22o7k7vc1652/88737652198.pdfIn PDF document text
    • http://hkwwta.org/userfiles/27246392928.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/30575756218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=partes+fisicas+de+la+computadora+pdfPDF 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_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 19232 bytes
SHA-256: 1a8f2955709e0dda76b10ff30c6aab33f34972ee54e8dc8f588d1547dd761548
font_01_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 10776 bytes
SHA-256: 85669fa2bf9dab30928d7a245db1064fca5173f7a39239d658d83df2285bdbeb
font_02_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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