Malicious PDF — malware analysis report

Static analysis result for SHA-256 619df80199fa2ca8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 08:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 72cf41d3cf43419ea991e1c6068ae6e4 SHA-1: 0c559d386a8f421cc898696a222d2a56bef2ee9b SHA-256: 619df80199fa2ca89069295f7be4ff11d29769c8290b500831a22cabf0f666d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=abnormal+child+and+adolescent+psychology+wicks+nelson+pdf PDF link annotation
    • http://clase86marista.com/clients/25276/File/91958198514.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/83346369493.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/68988527027.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/74806175643.pdfIn PDF document text
    • https://seerupit.dk/assens/file/62379557903.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5cbc44db852357579205ed2c7f27cf43/41840894151.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/bb4404fdde687c0b7d02800794a5f0aa/movigoradav.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/gekogu.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/busisetirixilifalazoxox.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b546bd56488---parapetuzubekotuvemav.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/8378230559.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce927cc8d---93776672967.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/u031fmf5alr297v321s3mhvenl/69260830721.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/tupukipokodilofupa.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/bpiks726q6aet6mde721it3955/94393547504.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/35656891861.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/jefaxiroboku.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/ganusotabuvejeto.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/28338381717.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/39f71b2bc1e36adf4d15b3472865cb67/dekaxunodagu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0d859bcb293b92b87a77920d3b8e67e1/xuxigilubo.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/lusumegosavolepogobafali.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1437857b---zirikuzixarep.pdfIn PDF document text
    • 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_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 18384 bytes
SHA-256: 4bc7d38c0e0aba07dccaa15c906159d78b8138d94092bf6ed90ab09dd832710a
font_01_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 11480 bytes
SHA-256: cd9e9fd4c12334ca349ddee3a996bc1000cbe221e6b877133695f3e52aa88171
font_02_sfnt_off00011c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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