Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7a5d6da7c42691…

MALICIOUS

PDF

84.0 KB Created: 2021-08-31 20:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a189191150de56292ee3ce0fc371557 SHA-1: edabf36ba052de5bb6747f28884c7b620ae26c40 SHA-256: 4f7a5d6da7c426916d38cc6228880a908d6f6ea16a428754892e4d1d9c7d6bb5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern observed is the use of malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+is+the+name+of+jesus+brother PDF link annotation
    • https://atlas-consulting.ro/fckeditor/fisiere/file/92417113050.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e9dc51390e6a1e04de2f18dbfa9c477b/zizixexowekexep.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fac5205a---60450881643.pdfIn PDF document text
    • http://sgpeo.pl/users//file/supobewowapibut.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48782aadf---gudiwupidiv.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/bulogovoruketogarux.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/waxasaruridevugunadafimo.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/34235629522.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/6188661987.pdfIn PDF document text
    • https://emprenderem.cl/files/66063526300.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/tikisefisuki.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/72824777500.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/dulebixarugaponinow.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115390e6320d---lazumodokefoxepidedug.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/418164e23ac20209e2dbd2610773e8ba/vogik.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbecf871dd---pavekotegowa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a4de199cf2165449b86942aa20521df3/22192300265.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/posizo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612b302802507---zavixitezojeponimev.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/83078025032.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/09092be6fa0b0c7421505a2283d42def/72406787048.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/niliru.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/doxesedipajofijakevus.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081109d49653---87194164552.pdfIn PDF document text
    • http://elitvorota.ru/f/file/topilewibasov.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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 17356 bytes
SHA-256: e04a99b0af033ff3153a6e483cc5f12bbdaaa040d78b8024667444730393825d
font_02_sfnt_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 10796 bytes
SHA-256: f0fe17ab733e85b5d8adc1fc90117f3875ea4866050b471cab04ddc89ab262e0