Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cc3a1c0dcd17d2…

MALICIOUS

PDF

93.9 KB Created: 2021-08-17 02:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b266c295c35622c8c23cba253d10e2a SHA-1: 02ed7736bc25d32076af6ad50c61d3dc8501bfb9 SHA-256: 49cc3a1c0dcd17d20bc4a9b2198fd255847bcc6750d354bec9c4865a7b0ec076
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for distributing malware or leading to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bbf57014a---548953843.pdf In PDF document text
    • https://easybuildapp.com/files/uploaded/files/fakure.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4090f73c41---70719757350.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af5bb785c1a---mofenu.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/sisiravaxudepaxub.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a899ebec2c6---97842238277.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/tezuzipimax.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5ace7e59a---23403016975.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1babb24209b5ee184f6ca1c72fd6fb2b/vavomexufefalaxexibobub.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/27lgppg1gpipoeo0lbg0p6eo3r/86965153398.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/121058668.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/wurarufokiwimov.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/48378191053.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/18955015531.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-13/20210713202928592142.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/75855533408.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6p5g67kqg6iurbqonb0athenst/65667047431.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/49674285695.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e5d2410fcd9f263f4afb9876898fa168/dofup.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/jifebixivarexaki.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kelabowimon.pdfIn PDF document text
    • http://air-ned.com/uploads/files/57235452840.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e389a1e9a---66456944118.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fc042e3f---lazadevodavolibosutuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=graco+slim+spaces+compact+baby+swing+age+limitPDF 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_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 18004 bytes
SHA-256: ac73680b4f1adc8d4452bf3d661ee4c6474fcf944dd1061d0857209f6d48da92
font_01_sfnt_off0001369c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369C 11096 bytes
SHA-256: 62ac9077cc3893d5140bdbe72e507d4ccd62b4acc70d15a05b65362be12e0707
font_02_sfnt_off0001505f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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