Malicious PDF — malware analysis report

Static analysis result for SHA-256 d083d5c124443995…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 17:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b81206b192cd8255b2bb2dcea9cbc7cd SHA-1: 6ec2cdda4ba8916268615fd22debc0b4af01d6eb SHA-256: d083d5c1244439955a129911e4030c4a401af3360b07eaf762fb7dec2168e8a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8b4e167ed---89711268141.pdf In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/28102847894.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075969a0fdea---tifik.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/juxoxofuxabanatowalet.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gevijiwajiguw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1f909121---85229697524.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/mogovok.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/nijinide.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/furufavute.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6df86c654---74467668055.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210819094311_4kg68n.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160898d4b0fede---pumoloja.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ff408175d179c01ec8ac0b82969cd215/wusirudigojovuvawefew.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/konalis.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a501723b02b---22565253283.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/mokolejadumajesozupem.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b0a6ea8ad6f0c1e31e18656405e20dc0/belukonenawekixil.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a207ab909b15eb9e597a44cc91c49575/pesegukevukabejaloj.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/fametogojowozitixogitidef.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/maguzusenamafijukojene.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210825/files/20210825111424.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9b2ee71f11bdcd34802300a12bfe65cb/15675817364.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/66043051367.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tvr0cepksj1f2o7k951g9qna7/fopotomegewabozefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+leather+armor+in+minecraftPDF 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_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 17916 bytes
SHA-256: 2ed67cc81b3526a3bb16649db6602ad577f7dfba4262da59a1c183a5228e8d71
font_02_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 10600 bytes
SHA-256: bfbb5ecc5be0ec0439a989748bcd4acbc5a01dd20bea9b4a535e6a68b0abaf07

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