Malicious PDF — malware analysis report

Static analysis result for SHA-256 940e0b94c3fadbe7…

MALICIOUS

PDF

87.5 KB Created: 2021-08-20 15:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbc85a9343998f3f033b88d6bbdcd3b7 SHA-1: 450103a255e078fb9eee8c551469cf15c037edd7 SHA-256: 940e0b94c3fadbe7d317a9838931f5bc5245d60ca426bab9e80e6480b746d457
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links, combined with the PDF structure, indicates an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f2489151---zeloxime.pdf In PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160842f98d324d---dagararuxidoguto.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/tksq1s9ql0kcko1oqu1121j7p4/datukikotetexejuvetaxa.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fec2eb0af---vekibuwerinupadiza.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d82d1ec8225---49913994579.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/pumaworufibuveduka.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160962a9d47bb2---gexinagafumufi.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f368d06bdd41f1d6679a3057555adc7a/66484621904.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/16560962499.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/wabowuwomudepewewezok.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/27869618434.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9b838775c6bb1e29e20e128d461228a9/gavodokipafevotawowefo.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/93356772498.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6b06b018fd16029e14431add978a6a06/16863198174.pdfIn PDF document text
    • http://tayles.com/uploaded/verolulegejovulexaxow.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e1f24618---renubadewika.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210704_084352.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/gomirokogixasituj.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xowozitetojejamuzi.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/5976492640.pdfIn PDF document text
    • http://asztromiskolc.hu/ckfinder/userfiles/files/juvininegemizabegi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/41b385b1ba9e7e4a06d90d73f679d141/fulusakifisesa.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/meresaxafifazorodotel.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/78492389266.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160819615dafb4---56445802957.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/sazakuwopitov.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e723bffb3---vetotafovinig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cavapoo+puppies+for+sale+near+me+cheapPDF 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_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 17528 bytes
SHA-256: 88f46ef6a42ca7d91800d717acb4dac7a1cb30b5d994be800a39670e6a6c9ca6
font_01_sfnt_off00011f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13719 10844 bytes
SHA-256: 0217f80eda7e5b37dd5ad62db8179777b87bfd950aa1d7bf4a04e923f0bb471a

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