Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0e505fd8347069…

MALICIOUS

PDF

106.3 KB Created: 2021-08-04 09:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: be4ab3531d441174db3b017d52e3edc5 SHA-1: 1a0c66b47a9e21b1d7c590ce7b64127498cfc562 SHA-256: ca0e505fd8347069e6942e89bc383cbd3e8120bac81ac168566266943f419f82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of 'utm_term' parameters in some URLs further supports the idea of SEO manipulation or tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dec40f191---38475632905.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095620d16042---jojexuxetoxubisowatib.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160814ea625e01---53739019590.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086933d1d745---gunemutizivomugod.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/73854047873.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/40512058435.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8b3c9236---2327648484.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210715_1AB95FCE0464C5A4.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef22a63184---bijoluseroziparabakuni.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edbf777cd85---kuzijawerulepas.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/27234241670.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/19623070533.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7539c0eb4---xusavefekulirufasolid.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d83c6fd8d---vetuvin.pdfIn PDF document text
    • https://defi128.com/userfiles/files/mesugukum.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/26623677026.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/68864279241.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665c156932---wufonirode.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/fojaxovob.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa97502cb7---fewojekuxidamoxujanofak.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/pudedan.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85eb2307e2---saxorimozixusuvozexiw.pdfIn PDF document text
    • http://kfbi.ru/content/file/muzanagutawukuxigu.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/tivigijofanovisel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=strike+force+heroes+1+hacked+all+weapons+unlockedPDF 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_off000136a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A4 19152 bytes
SHA-256: e37b7fdf78bb8d7f15de2d90d0d112c1423677193677a2a62047aa80d8b6d79e
font_01_sfnt_off000168b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B3 11120 bytes
SHA-256: 15a4dc2a7f4c9ff1bcb6112a4773a2de6f1d76b018a62d8c7b8bfb72f087be1a
font_02_sfnt_off000182b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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