Malicious PDF — malware analysis report

Static analysis result for SHA-256 02105750872b9dc2…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 20:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6b29c13d73542f0264974b7ad68b2a66 SHA-1: e9c36916d86e18bb835474d426fad4afe2ab94cc SHA-256: 02105750872b9dc2c9e6824e8ae7cb97df5162b02af8fc9564fdebe0e04f55cd
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also contains numerous external links, some pointing to compromised CMS uploads, suggesting a link farm or SEO poisoning tactic to distribute the malicious file. The presence of a visual download button further supports a phishing or social engineering lure. ClamAV detection and ML classification confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=storage+form+of+carbohydrates+in+animals PDF link annotation
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/40684697467.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/29564251851.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/99433624134.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/44805147958.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/kijufoduletokokegokuzifo.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/jexezebunosisozibogi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16151f31ac90b1---gazoxajesagefifedidofamo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2b9aee121b63ba2bb7ae73614c6a5caa/loroveru.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/57340115355.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/64726765781.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/nowilaribitazaxiginirem.pdfIn PDF document text
    • http://rubensova16.cz/files/file/fegewapejuwogikabaxo.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/42135955981.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v6ivj8jmo9lj1g5022fcnb8ta1/7322488923.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/sazalel.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/mapedipovabimimezuxapeba.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/30064637404.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/986954391.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/jodubi.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/97368846566.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/93780619473.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fadesajekiluvadegit.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/8896143589.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3ed1c79a---jefasoj.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614da67968634---depevitolox.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_off0000b285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 15972 bytes
SHA-256: 6cef3a4701b3ca870c96cbaaad67412dbeadf647db9b6d2341ef9a79b5b067b0
font_02_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 11252 bytes
SHA-256: 36b8ec5600acb615b5ec119a7fa19154eb75b308c47292be1dd037df5f31a632

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