Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb36d31599e25b24…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 06:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8f3a49244ee0cc7eeb9296ec385e6e46 SHA-1: 99d8fb60e312648e209dd433e189147393eafe0d SHA-256: bb36d31599e25b243b13f4d94e8af23c867d292ce9199d88b3d46add9bbfe5bb
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 CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=gta+android+tv PDF link annotation
    • http://basketaci.cz/UserFiles/File/lakonamuvigavifumovasoje.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161386f63cc998---nuxonuwazazimafugemobiv.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b1c48fbff---40914947400.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/mopejeb.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/64122827454.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/87875172045.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/sipowanibumovixaduke.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/42516131547.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/wenirukib.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/bevademot.pdfIn PDF document text
    • http://rideco.hu/upload/file/xivitutixirenivenajutu.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/ledaxijodavan.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/80899595134.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/pudefodiwunoj.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/35348957869.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/kevasivazafo.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/11685558466.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/5709109865.pdfIn PDF document text
    • http://gibisch.biz/files/files/88569653566.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/48621177258.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/26819015532.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/58457743150.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/50985198381.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c231f553c66f4471995bcb874343d3fd/8371071047.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/gixubawapiresitedavowam.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_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 10000 bytes
SHA-256: 986e987c702d762d4c44b221cd9d2a5709a5cf5fc9a3794615fe30ece47ec837
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 17664 bytes
SHA-256: 0525504e8172042c5a4e34c1036403c92043572e60d08d34734d1dd4baa5c5b2

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