Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73c2766d3a1065a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 12:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4988d679cb6e10d7cd0b1692c07153ff SHA-1: 6f60928c6ebde3e60c05fb3632500fffdf7c4575 SHA-256: f73c2766d3a1065a03094d135033b059d7f56daa8fecf6a2a2b6a9d75c9bc3e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=phone+multiplayer+games PDF link annotation
    • http://elrey-uslugi.ru/media/file/71748302589.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614033d2c8f62---23413487996.pdfIn PDF document text
    • http://spharma.ua/files/file/72057039673.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/zawavamepovigala.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/61512154500.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614501c355926---90802874158.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbfb0a2901---lisusajibidazidosit.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/lasolerepejo.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/51812601990.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/85287731276.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161407d1693e85---58808402464.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9n4fb05lff30ai96rd06vj827q/98432878508.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/xakixexetik.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/52245894637.pdfIn PDF document text
    • https://olterus.info/contents/files/vemogapowavolivutik.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/3860276874.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/47268344190.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa096dc136---25210714899.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/98942337627.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/rixujulupudogofi.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/54024405192.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/63047651170.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/wobukonosoxiwivowilo.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_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 17280 bytes
SHA-256: c7f4ffcb95d4551253393fdcd2122427e11372468bf799615b6c7e5f30c54367
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 10916 bytes
SHA-256: aa7f945ef10eab74806e8838fd7f8c1b9d9d099fea02abfff1cdbd1c6aaa2064
font_02_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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