Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97fece980b6d7db…

MALICIOUS

PDF

100.6 KB Created: 2021-08-04 23:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a37bfaafd5e5e0518c7710fe91b356f5 SHA-1: e5cdcfa4df055698d0903c0fffd09f74dcb6b09a SHA-256: a97fece980b6d7dbbe29f01cc59af64236f95f6f2904f6f31adbb85b8e2b10da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. The presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=pictogramas+actividades+para+ni%C3%B1os+autistas+para+imprimir+pdf PDF link annotation
    • http://uhy-th.com/image/upload/files/71601298920.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3e5v7ben0sn1qd1gljl7811909/nufemika.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/jetalemipevowijuso.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9ce7be6f68953ea1fd43ed308d0d0135/50565247145.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gemixifumidita.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/kekopurafobad.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/boxepezirogato.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/02krdl12j6tgp579at5dt3vvur/muzilitawol.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/79728451635.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5156da859---61751665162.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8rsgitvabqthm7d0es9uotgpc9/wafoniwixofodovevalumuxaw.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086a41fef296---rukomuve.pdfIn PDF document text
    • http://www.puhito.hu/uploads/kutixegiralewezu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5bceafe5e---dewasosikemipaporixuwubo.pdfIn PDF document text
    • http://bronia.org/userfiles/file/mifetevugijifulosikobojax.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f428b5e6e8---miwisatabano.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee70f6589ac---71952316019.pdfIn PDF document text
    • https://netpage.info/userfiles/file/zivinopufuzamemobediriler.pdfIn PDF document text
    • https://media-get.com/userfiles/files/febisapojulesowatokonam.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/zigisotuzitaru.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/9728137166.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/gosidi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/35b9023755747a00838581a2f3c8b113/60434838986.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_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 19828 bytes
SHA-256: 1c18f53b5851a39409102a90128ebe2b411d0e9c7dbc7d832070abd35414389f
font_01_sfnt_off00014dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16616 11292 bytes
SHA-256: 3550ef8c83a98e9718d17e9bde12c65ee9dde6c10203e65dfbc5fdd3c51ebcac

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