Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29004d552564489…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 21:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c89a67e812b9f7cc5e2b766c62eee732 SHA-1: 66ba687f7e693fa30100926535dc56a6d9db31c4 SHA-256: e29004d5525644896ae0d936df14490e6a10c79b54ed287c4a7a579bc52a0c6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566 Phishing

The PDF was flagged by multiple heuristics, including a ML classifier and ClamAV, for being malicious and a brand-impersonation credential phishing lure. The document body is heavily obfuscated, but the presence of numerous links, many pointing to disposable hosting or compromised CMS uploads, suggests a link farm designed to redirect users to phishing sites. The primary lure impersonates Microsoft, directing users to a link that does not match the brand.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=thunderbird+alternative+for+android.
  • 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://maintogelonline.bet/contents/files/44258302494.pdf In PDF document text
    • http://tamtamphat.com/upload/files/39822423525.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/81688512111.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/biworozubevex.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/lasorefomududaverapizota.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/lozalujukewerujoso.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/76416107789.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/wasuroxu.pdfIn PDF document text
    • http://keacg.com/upload/files/34810904142.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142247ae8e18---92332636922.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/moralefowixala.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/nitaleguxesedu.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/11411662743.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8be8a5a35---13067081538.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/puviparodotasekozudujit.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/dufeta.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/12839766491.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ba67326d---jipalilosevapom.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/xisivufozujovipejataw.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161364303c09a2---45998979219.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210905234619.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/ribewewogisepid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=thunderbird+alternative+for+androidPDF 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_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 10552 bytes
SHA-256: 7f252c783681bf63d80008562534ca9cb2c2f61af03faef5174722101e54287f
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 18732 bytes
SHA-256: 7c3b64c162cddef1cb1560902c2bb27227dadc9c2808bf424a2a1c818f696e1e
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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