Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b8967b90974bfc…

MALICIOUS

PDF

75.5 KB Created: 2021-07-16 11:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17ec07a02337a554581bd177c5e1989d SHA-1: a3d70349507f593e67f0b2fef6ca584b36518ab2 SHA-256: b7b8967b90974bfca7cd4b0511a006cb754c50985cf381be9516f451bdf90910
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to download and execute malicious payloads. The numerous external URIs point to compromised websites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=how+to+search+a+name+in+pdf PDF link annotation
    • http://shinies.ru/img/lib/file/70085581344.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2152474113.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe0919de5---7281981888.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f2968e006---budojujifugeliwapuximume.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a2756af2066d9eb841fa3eb01f3908d4/36353852090.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca9e0d38c---83000768783.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf8c08295d---85256806957.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/nosetuxebodinomibojeb.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980a35bd04c---xutapepiwakeja.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cc03ab1c0---81565314056.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/kajawazazakezabaseditatap.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2fe55cba0---fetozevuwozuj.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/65656929957.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/tarisapol.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/dodobimumezagabafudeturo.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ogqsh0jnee0sissbmi2feo5mli/dazojax.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/46843465823.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3af65fab4---kopowodusibav.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xarebixipulemofikar.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/053c51769a4e70c450a813cc8aad07bc/kidumekibudo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/fufinoxowudano.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6a78c386917f6e2e3b1404c69bf40bcf/ribituxapaja.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092639597fb0---85783415956.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/k4n41kevem76a2rn5c5grsnbu0/11386602715.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/29111951861.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_off0000c563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC563 16560 bytes
SHA-256: c783022a7cf0bda280b718f2addb7770a2d1d9b1e68f19c1f897c82564e332ac
font_01_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 10916 bytes
SHA-256: 336404926cc752d278582a7d2c571e52a3f9b690be4bb366bd0a16065f578b3e
font_02_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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