Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c05d4bd8f60597…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 06:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bf6fb1ac5d0a431896f0d637112d108 SHA-1: c90e7355301cbdb8f631840e054928b1202ce320 SHA-256: 77c05d4bd8f60597d3264a88f8d3a2ca9b4b51155f67224cce0ac340e5dec96d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=gameboy+advance+iso PDF link annotation
    • https://xyoaa.org/sites/default/files/files/lopufikifoba.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/jawukuzerojaxika.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/funuruvoma.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/pazedimoguwatesopajumed.pdfIn PDF document text
    • http://generoussecurity.com/uploads/46883389230.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5d27f4bb---23858334368.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/zezufafoponegetifuwogilef.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/gifavu.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/filuremefowumusirofebire.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347df59b07e---wenozunemi.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210902045226.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/sogorovubakijobowenegafi.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/panagezebabarenona.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/36076856670.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/jabewapubefazupizadenovib.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/zevivononizojodun.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/tuwonira.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/leburotosir.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109050104531094.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/pulivarilobubope.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161365760a5a3a---bugizubufiwofoturos.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/zewimutowewuz.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e8c08f24468faa33d2d24dcc638e32fe/25889365695.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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 10644 bytes
SHA-256: e756d4858ce231486a6cb328a549621639607be3d836035118f3b5ef5c99591e
font_02_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 17944 bytes
SHA-256: b6413a8b6c34c51b65a4c94426785e99e67962edb16c731ea9841e7ec4858775

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