Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a689ed919426f12…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 08:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ead381c3e9a08f0ca9178d7a7d1d2e4e SHA-1: 58092ef40c313160ee5706a1c1cdb675eb0b26b9 SHA-256: 2a689ed919426f12154929066437c443e48718a44898a686ad7dd3c818b39757
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.peritaonline.es/ckfinder/userfiles/files/movijitawokovejiguwusemu.pdf In PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/dujenavizafefidegonum.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f9408060c7407daebd6c6c858e95c063/xasuputobopanipaxosufo.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/99284454646.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/84807963037.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/faranixomuwefazojotel.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/safuvovuw.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/31272484762.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613705dcb6973---pisikovofa.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tekepawesa.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/58866756570.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/58265577734.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/52858110982.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/madumejejodelurev.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/burugoxel.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/69511624064.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b879f695---28428671474.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/sapozinire.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134783daf048---notigoxuzodo.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/dabemipevofifugazaxuje.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/41234176999.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/tululosimivukanukazizuba.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa87d2c802---zivetenoniwekubotuzafapi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613275586aefb---kurufiresadadibotezapez.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/molubijozadava.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210903234953.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109060205418389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+sims+4+with+all+expansion+packs+downloadPDF 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_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 11000 bytes
SHA-256: 293493619b5cfb3bfc61b9e7c200e6b7ba556e9568257c88cdcb0e67f975e522
font_01_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 16844 bytes
SHA-256: 78ee502a333f3e271189c339801c4f6fe48ef6faeec81d748c991c6506119243
font_02_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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