Malicious PDF — malware analysis report

Static analysis result for SHA-256 b157ea9bb2880d44…

MALICIOUS

PDF

73.2 KB Created: 2021-10-04 23:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d3ed63a4365d7daca1d50abb1b18222 SHA-1: 33105f3e7a8b5d07ab8f6505db696564cdbf96c2 SHA-256: b157ea9bb2880d447cc12e5d6c8fd53d390a37679f65d13b052de2942a0aa14d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm pointing to compromised WordPress sites. The primary lure appears to be a "freestyle glucometer instruction manual," suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=freestyle+glucometer+instruction+manual PDF link annotation
    • http://francescofesta.it/userfiles/files/73345995435.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/vevugeweg.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614039228fd15---83142063699.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b543ee5e6---77306052050.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/68060302552.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/35727567559.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/zerirodabepota.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/63754700078.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/lurimikifurum.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/gapaxovumotakopug.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/76272602028.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/sitezi.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/nemufodesexefezumipive.pdfIn PDF document text
    • http://ktcz.eu/files/files/23896669611.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a38e277e76---47852520850.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/nuzirazajono.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0dd51b013d1aa1f603c46c7e07836d83/zexofuge.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75d9cebde---zedozuf.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/pidijovatopugatotufetar.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210916133533.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b7da3925904903446fee16e320ffe8b0/43577498974.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/viruxifenepidedixifoxut.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/50469005717.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_off0000ba98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA98 10764 bytes
SHA-256: f144f9560f3b96867964fc0b11d03df3c9b7ed0d4289e3b6e9b39306c50b2817
font_01_sfnt_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 16732 bytes
SHA-256: f1ad1128fa8e41d6af469b7a59ae24b07a38f88d6ea95e83647a6ab6d80a25f9
font_02_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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