Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda42fca54e29959…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 05:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d3425dc2822689cafee4d6e4c88fc00 SHA-1: 2db9458390007a883accdbd7172d0517ad333fe9 SHA-256: dda42fca54e29959bbb96b4e4b26d32bfcd296241113acb16497d1ccdc359938
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb8a979613---terejipukikonorimilol.pdf In PDF document text
    • https://contemporaryteas.in/admin/uploads/file/fewireseporuwigunef.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///rijuf.pdfIn PDF document text
    • http://exosushi.com/uploads/files/26617362542.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lim0ucp81a3ppd92rvfaic8p6c/kujuputilotapow.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/sajiv.pdfIn PDF document text
    • http://varvshistoriska.com/file/29433939884.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/o8ljmv2qnb6jv2us16i0bjgui4/34603926620.pdfIn PDF document text
    • http://sbkf.org/files/files/wederenaxixurusi.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/53532689055.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/68699824774.pdfIn PDF document text
    • https://baptistfriends.org/media/zarazerozegilesiviwo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d1c2f3c8---dimaladijiku.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/lilosuvexawubulu.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/lejomu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/99352718829.pdfIn PDF document text
    • http://js-space.de/userfiles/file/5258527718.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/malopav.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4344a2552---xosajipifokigasu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614226cee6d1e---mijikazob.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/12269223952.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/89938874535.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/jijenigusopujaroza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=snapdragon+865+vs+ps3PDF 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_off0000b285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB285 17328 bytes
SHA-256: dc652604802e607846983a91970f677fd385e582b66906c8ee02d3baf35a0fdc
font_01_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 11024 bytes
SHA-256: e97549898b6f40493e2bf0d37c98c9359d1663ed841fa410640490dc20330cc9
font_02_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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