Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7761d7bdd3cb0e…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 21:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6f3d6ced66d16c7370b25e84046fff6 SHA-1: b6f83505a62f8cff4095668ac1267d25bbf55cfb SHA-256: 4a7761d7bdd3cb0e8c187018e3425773915d82df9251699c0ca9e26853990419
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised content management systems or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=causas+de+malformaciones+congenitas+pdf PDF link annotation
    • http://maxbrio.kr/files/files/loludup.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/kuxolavobexurume.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ee4ed0e99---33929456130.pdfIn PDF document text
    • http://merwepizza.com/upload/file/xibonejitixuwekojan.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/jugarulurikulijulepudoko.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/likiziji.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/mofusu.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/81446609220.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dfd6b5efb---53024281592.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/8bf5288c65a2a78b8c2879b7c7b430a5/41250806794.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/79118036986.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/tudigamoxalukime.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/v97gtpeb9qmpsbpju2smtlm027/42079697860.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/xusasoregipefo.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/65487223054.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90482c3266---sawidavataposezuta.pdfIn PDF document text
    • https://lapakunited.com/contents//files/votofemapumubuxinipekege.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39dd2fce7---vamiwakojunowopit.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zilekadawumawanevokakiwuf.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/nobh7fu0mhfr02hr7ota9rj9t6/taroxufifababe.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/86243853818.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1fcfbd2b4e9bbe352d5b57d9d3021dfe/rivatedidefeduk.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd698eb05d2---dugusojovimawiraxobewuw.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ta2t7jb6mrcji83pmluec2n7f1/givisusewamune.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ec8f6171ecfcd44d8af9f76259a79db2/tuledefemoparosiw.pdfIn PDF document text
    • http://onlinevay.com/upload/files/basedogefu.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_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 11092 bytes
SHA-256: 0293baaa34067729686299951b9507e1da88cec35b0becca18cea50a2413f5bf
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 18780 bytes
SHA-256: 6ab10a475ebe91ff59a8c539cea3bbdbc4efc1c69ab274da6491dd3fa1a857d4
font_02_sfnt_off00013aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.