Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a100e7ed9613fbf…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 01:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77d4e400d7c2dfa070aefb5ee5b05389 SHA-1: 5b7d25211e94905283c6c6b811046df32354a875 SHA-256: 6a100e7ed9613fbf3fd1dd34f304787e3903ab05402369aaab47d2650e7f26c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are non-clustered and hosted on disposable or compromised domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://chcial.ru/uplcv?utm_term=personal+narrative+graphic+organizer+pdf PDF link annotation
    • http://digifast.cz/userfiles/wakiserananirevejulukarav.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e9d3222add6e433c3f639fc7d9ebfac7/jegod.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kexipiv.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/15456022114.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/kusiposubowefaketadigira.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/jukozisifutakaru.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/86142482030.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/dinumibonubademasisol.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/lufazilofatul.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/43246097423.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e567438f8f---gazusadevewulesidazib.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/43991409747.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/jemuviziti.pdfIn PDF document text
    • http://www.bandungmesin.com/file/wekumuwumomuwiror.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/25249452527.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/55248048188.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/7896412396.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f0a25f72e---benujezo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9d488eddc---fipejujujilujesuzole.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/leruruvewe.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/zekebimekuvapizapi.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/91225475348.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/69205628606.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/34703498372.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/66663291470.pdfIn PDF document text
    • http://topflexsports.com/uploads/mufunasu.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/99994850596.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_off0000b772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB772 11028 bytes
SHA-256: f79005927abdbbcf6cb57a20e1aa46563c90fd17fdc961a1d57bcdc10e916f5f
font_01_sfnt_off0000d0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 17000 bytes
SHA-256: a25dabfb06514a7cef86f71799827e7120102b56cc7fd649243b6ee0bd6a831e

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