Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f732d3546e519bb…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 02:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e4c4808ee4541a67a8f43707011d599 SHA-1: 9c09e809430991933929b64514d2902fdad8a5ae SHA-256: 8f732d3546e519bb84fe338be1f9fa16dc80ed096bcf03336474148c94834ed4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=zelda+apk+free+download PDF link annotation
    • http://hcwan.com/userfiles/file/dotino.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/lupimogogewokelixebigamo.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/56916913843.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/23170474320.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/finukupisuwuxiluxiginulo.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/xoxutobipigufuw.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/14q6b30s7t8cvrg9094dc058ci/tugoweluzajonoxekekaser.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613292309d214---88957162412.pdfIn PDF document text
    • https://strechybenesov.cz/content/37376062248.pdfIn PDF document text
    • http://brenderup.ro/mm/file/dowixozib.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6996550350044b9a073ce5ff588dac18/bimevexemo.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/78442068752.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/87615705203.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396b0c4e26f---fukasenera.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/wavafarovedevewarifi.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/41158229195.pdfIn PDF document text
    • https://kultmotor.hu/images/files/zewananibiwevikopubadeli.pdfIn PDF document text
    • https://megashina24.ru/files/files/78884777864.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/pemalemawiketiremufep.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/dinonagip.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/makowurukilorugawe.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kaputejelukidevow.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/zefuzatituvonukujo.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/dodiginavefimazezo.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/nofisakat.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/pexetowal.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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 19524 bytes
SHA-256: 3abfb32e00b48e37c1dcfe5c6223c282cb27548ba79fd893a0371d3081a3b773
font_01_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A6 10276 bytes
SHA-256: 5f32c94941603b034c1f6c84eacf271927f4dba7bcd406a1b4abe6f63515039c

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