Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cd7b92b07eb5ec…

MALICIOUS

PDF

122.2 KB Created: 2021-08-18 01:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 0a4645ba2dda27b83c96363b7f640343 SHA-1: adb682cac46de6a0dfb4ccde69169e4c9deff635 SHA-256: 40cd7b92b07eb5eca946ccc3ff7c577eb708d12e3790e78908b2a5ef0f189607
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 http://opuspointpartner.com/ckfinder/userfiles/files/75612087254.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c51046bfe0839a119ab2603c5d677abf/negepelanaxebelis.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebaa8a6544---52997600131.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/lufovexudobexu.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/26982395138.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/91e24624elu6anufk2upsg8f7j/dinarilowepupejogadamavij.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/bibox.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0be6298e7b6b85c0adaa75712e5829a2/34852322697.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/38490431348.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/23235397467.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/fe6mdn7i9rhddukm5nmljvt6f5/769963887.pdfIn PDF document text
    • https://menu2uplus.com/images/file/68732206951.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/putamalosu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f597f2088a---matabixifoxeduzof.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2ccc18668---78085307470.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096de3e4e038---60469896247.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/7826269991.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/xodasenejis.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/bevawuwerovigubat.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/52688078853.pdfIn PDF document text
    • https://andrejc.si/files/file/penosuzejasewil.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/28227230024.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d2556a66659fcd0b7d91f06637746215/lofarenegoremuromivuk.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/mezebanuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=%D8%A5%D8%B6%D8%A7%D9%81%D8%A9+%D9%85%D8%AC%D8%B2%D8%A6%D8%A7%D8%AA+%D9%85%D8%AE%D8%AA%D9%84%D8%B7%D8%A9+%D9%85%D8%B9+%D9%85%D8%AE%D8%AA%D9%84%D9%81+%D8%A7%D9%84%D9%85%D9%82%D8%A7%D9%85+%D8%A7%D9%84%D9%85%D8%AD%D9%85%D9%88%D8%AFPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00014a48.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14A48 31568 bytes
SHA-256: d4c7b6320983177e3127dbba5fd8093049b36f6280ef58294f555ac8831bf213
font_01_sfnt_off000181a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A6 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085
font_02_sfnt_off000193d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193D6 19936 bytes
SHA-256: fa366e56849b5a873cac8b146bd80e7cb4fb3482030fe556586eb3878a61e3a0
font_03_sfnt_off0001b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B55F 13924 bytes
SHA-256: 95e621e598db3f19515e6c83c79d8ba7ef1f0d1e426cdd705af843b19398c9af

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