Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c3a36efcb77a19…

MALICIOUS

PDF

82.6 KB Created: 2021-09-22 21:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a737d992ec33c6ee9e0270b6e9974db SHA-1: c7a1dab060e17f0c55d254eb98d9a95aab690496 SHA-256: c5c3a36efcb77a1950919301b435532562df537accd5c6ad1f41ed03778b0e35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Heuristics indicate these links are often hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=contract+killer+2+hack+game+download PDF link annotation
    • http://www.rajpuc.pl/pics/file/nifobunoje.pdfIn PDF document text
    • https://ultralloy.net/upload/files/mutexowivo.pdfIn PDF document text
    • https://laps.pl/userfiles/file/94574261900.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/vodemasesubesina.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zomesonuginovedop.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/moxexabegofifakeraneki.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485d6c37087---20695765174.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/73559690457.pdfIn PDF document text
    • http://dezis.ru/uploads/files/gapoteze.pdfIn PDF document text
    • https://dom-titan.rs/files/misugab.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4012985fec706c2b118b3f408e5e09c8/37621482112.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/cc3f3a1933cb4deb9ec188fc9caa2e26/81411790653.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/76084527352.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/sakefebowazozisotokudaje.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/13363358537.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/63387306598.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/5158505672.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/rijodadetegozuwaf.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/11113559227.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/78152374927.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/dikit.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/10117312903.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/pumabikarusinazilaremez.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ikuv4kd56qpappkbhndd5v01fo/4817475923.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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 18940 bytes
SHA-256: 20f43f5c0d88a4d7610d79bb7c71f28f09e9b49de08c837fc0623eb725e271df
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 10976 bytes
SHA-256: 62c12d81defae8fec0a88832b1524130d6e0744226305f4e2fd2ffd6f0c42389