Malicious PDF — malware analysis report

Static analysis result for SHA-256 92da721ee0da3c13…

MALICIOUS

PDF

94.3 KB Created: 2021-06-28 02:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af08c1b4b234ba46fb24e036b8a922b1 SHA-1: 103841c31ec7bd75a442aa910b7dea290c809473 SHA-256: 92da721ee0da3c13e03c1dbdfabbc964a065a6a2f4b7b97c3d4fa9cc21ccaf23
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 a link farm and by ClamAV as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b7569c13cb86675a8945aeabfd3eb58f/xavigetapazovara.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f28376d56ec5285011ab419c634d4278/supivekolonuduluwobagel.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a00bcbf395bb3f96ca9e81e454285105/tufekefonepijosovowojuvub.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/dakewa.pdf
    • https://atcotourismtravel.com/userfiles/file/lisowilopokowezi.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ftgk9mlmd979333dg5rhgr49r1/wafudumem.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a2394544c56---never.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccd87bf71---rokoxanipegovuwexisa.pdf
    • http://quick-thailand.com/images/uploads/file/xolazukadojubila.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f435592cffa7986ab35a8afda867178b/xidafejibir.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fdfe0062a---gebulebaduraxitilubikow.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843969e4e81---64734928501.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/io6s5re467tfm3uc4bbq6rfgvj/86269678189.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743b07b3285---7898524965.pdf
    • https://accuratesearch.com/userfiles/file/65313236694.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/25753434323.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/tejaxojuwetapadopejik.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e478e6e58695ba2b9e8130217089f5dd/nafitipu.pdf
    • http://moristas.com/userfiles/files/2665803368.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2r7assf5jsfi7onb3ti1os53vn/65885516470.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/nonuxevofidipez.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/48cqksga96idgkq346gqed2tp4/gesoforukebebel.pdf
    • https://aravlicraft.com/cmsCart//upload/file/91278949921.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a282e21c---gagixuxuviku.pdf
    • http://www.serenissimaservizi.com//files/fuxatusen.pdf
    • http://budaikepkeret.hu/uploads/file/67917251614.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=blood+off+couch
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001125b.bin
b811568c3cce8ab79173d94ba89c9ffb2eb8ef75f86bffd3e9cf963a7cbb6f10
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 9872 bytes
font_01_sfnt_off00012834.bin
816b3ed265509117eebd71524244f4325bb83a9e1dbb5b989516234e8b4f2c10
pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 16820 bytes
font_02_sfnt_off0001540d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1540D 16792 bytes