Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a9a850761bd60a…

MALICIOUS

PDF

79.4 KB Created: 2021-08-02 18:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45c42d08bf318d36824f362a427c3650 SHA-1: bdb63420e184184e871e184c8db2feadb8a22273 SHA-256: c5a9a850761bd60a661f6f5d4108cf1b8f31cf60664bdf49e7455c7cc646a294
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs and links to compromised WordPress uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=craftsman+dys+4500+parts+diagram PDF link annotation
    • http://ankurgroups.com/userfiles/file/37971367152.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608685025d518---paxotetimujedizogitodub.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8afc892e---79090989717.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5tqu3dtakflqeqpn6v4he6n1r6/tagosinaku.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/wewipuzopafusu.pdfIn PDF document text
    • http://prosquash.by/data/76041098677.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9447063a0d180cdaaf2ef5f23d541544/lemawixoxavupenu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1ad5ec48110c15c7c7f3823e6753e887/kopebumelut.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/xoravezaw.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/66555827213.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jftld5kd98q44potc5vf8te1o5/56831087909.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1db72a847---bixokoxovagejawefuwafezu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a42e2cf8e---kolawolikikowuto.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/duzalibufadorakuwadap.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be2913489---xukiwisinewagaxixi.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/wikunoxiziwuvajuz.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c3402a3dd---11363534660.pdfIn PDF document text
    • http://qca.ch/userfiles/file/mejiregapamujonemawan.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/24699543888.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67c0ee213---bozigomiviroxe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097aa1d5bf6f---15166925846.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/dipotudazikadeziwepubomi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/76727352501.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f70db04e7bfe333c80c449e504d3046f/vusuzamomopizir.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_off0000ce9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9C 18872 bytes
SHA-256: ae5446f7e7aa6d9f3e179d1f96b6af410e36421f9df9999b768faf1eb661c480
font_01_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 11024 bytes
SHA-256: 595b9304b446de775d2ed8e9bca3d38600c43dba28ce1a2eb295a0f01b3cb207
font_02_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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