Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a11e90528f3bf3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 01:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 352624858b3dc2baf83e8e2abbfccbca SHA-1: d1f6020c7e5c70db4449a522958e0a82aed8caf6 SHA-256: b3a11e90528f3bf3a77fb4f6d57122749167f5d9bae0ae182ea74449cd25598f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, many of which point to other PDFs hosted on compromised websites or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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=fractura+de+pelvis+pdf+2018 PDF link annotation
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/784f314fc47989c5b8f5819e87d5ec03/kivasiferizetudibesekisif.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/bumavomewolipapolatogu.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/bebuposimurepag.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210905_FED2D27166323ED3.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/pedotit.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/fivedafodubiweboletuz.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/94e81810c54832ec2003681554984631/sujanasadudi.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/tekopijuzixa.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0u5ar88ft0cm33mmrtsvs2aje8/55453516997.pdfIn PDF document text
    • http://www.bevillelecomte.ovh/ckfinder/userfiles/files/miminipuvisedutatul.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/76292128538.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/32172366734.pdfIn PDF document text
    • http://ashioke.com/images/library/File/54301813394.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/19746669172.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160920804953a6---6286705374.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/nuwisepeme.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608439bcd86a6---18542570853.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/514749b2309ce19cb938a10866b653f0/37965705253.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe04a9888---76544439862.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2df90c02e---vazudineretekigunenuga.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/43259984726.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/969eded6409494f5c2bf1a8e0cc57e09/90980081525.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607490151f5eb---18139590230.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/48334394631.pdfIn PDF document text
    • http://cartopack.com/Images/file/relikidozakutunomiwok.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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 20120 bytes
SHA-256: d9a7821a152d85da3075d7c8f123827a4c2e032cf24eadf1b63639018d86a418
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 11036 bytes
SHA-256: c8ae4a00fa23850f2cbcc826bedf0d5f0e0f838783ad621bd83fdf04281097e1

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