Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5d7f91bc13754c…

MALICIOUS

PDF

93.9 KB Created: 2021-08-11 04:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bbe7021031e3a9abf07ec0d63e0b649c SHA-1: fc1a1c6561d009cca199f48ae059c6e52eb40e17 SHA-256: ef5d7f91bc13754c5a2f6b5aa27fdf2813eacf983255cbc1ef0f42f3377b56ae
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9357

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://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29503724295.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872048cdada---fenasegoziganagoresap.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/40801826275.pdfIn PDF document text
    • http://zerosquareonline.com/file/33451674263.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89c329bb3---tinefitovugokozobuvu.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2ee590d2fddca1aae1f480fb227e724d/73406184919.pdfIn PDF document text
    • http://mamam.by/upload/File/file/43702179376.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f07b9862---9480237525.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/319e62e3080983b604dc9c65572912b6/23973712241.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/sawigod.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/81370703461.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/toxutuzuzeku.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kerofitidelexaduzupuzek.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/11064892344.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/49153080253.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd5a3b06c2---kafedomubulefevij.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c98d8094ac---56866366517.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c710d8f462---lapajuxupifidaninaxawomaj.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc16d2e399---66272106984.pdfIn PDF document text
    • http://8njl.com/userfiles/files/tufosotonububenafokedureb.pdfIn PDF document text
    • http://master-vin.ru/files/file/22489687497.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb793ec2ac7---wiritubi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bbdc3a3c3---41410138251.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210811060438.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b01074f3f0024ede2b26fb62a7518b1d/49172332048.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8f415bc8---75270814393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=kermit+e+frog+voice+changerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 10628 bytes
SHA-256: efda6f138cc5882eba1c28f76eecac7f4f59a9234df094e7a7ec325b19df97f2
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 16932 bytes
SHA-256: 71407a33ac437d4177e45b3f5110e15505ac22ed28e0478d8094be8c8255bc4a
font_03_sfnt_off00015308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15308 16364 bytes
SHA-256: 3e163d7a0954889ac6348a127825d1cf1030a52c833756f7da8ce04c78165b61