Malicious PDF — malware analysis report

Static analysis result for SHA-256 f138bba6a6e9e836…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 01:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44904305271cfc6174fafce9c9db01b9 SHA-1: 4e207e0f5b82055ca42df8ea20e0622ce10874b0 SHA-256: f138bba6a6e9e83666dd7949f68eaa6e03fc81cbfc4c8a5a040640305f33199a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and compromised CMS uploads points towards an attempt to lure users to malicious content.

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 https://myagenda.myagenda.cz/pictures/editor/files/83328295019.pdf In PDF document text
    • http://tutek.eu/userfiles/file/59930466496.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/nuc28ggbuovj01jc5tusme04ms/lofalakafaweguwomoridum.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ad866bf7---dekiwukojakagelabekonujo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b127f9ea87afbe73638eb1942a103f57/12754738391.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/buziributekinanibak.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b95aec102---jugeba.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/b7055615bbf1a448aa96f2ad07a2c149/82567556407.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210622201850_xrc1ek.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cea291af69---dilisojazufodagofomavofa.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/sjqqtt2naag2edoluhssl8d014/kurebes.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/52560225498.pdfIn PDF document text
    • https://jagominum.com/contents/files/polixawokupanigidafit.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160858fea8eab6---2858295687.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/dubugikogazetexomupu.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/kusorebalokavake.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901035253.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/95c662ecad01343bc84463fa970088ee/47627129142.pdfIn PDF document text
    • https://edusfera.pl/upload/file/xebibelozeba.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/22466455869.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/82970866933.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bj32mengs434dcktmjdsdg4qv6/xepuliwu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3ba7b8fc---98047281585.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/62872719323.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d02fe84ac---58531994172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=de+dietrich+ceramic+hob+manualPDF 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_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 10708 bytes
SHA-256: e2068838121c7e3c7e956f835aa41af23eea4847e286c6d8fa072a3dc1422ed1
font_01_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 18832 bytes
SHA-256: 53bac47a70c478a1b98eac75a69b393bfdadb486ea092789f50317d29c58929f
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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