Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad196f921af35927…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 18:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db3d00042777bdddf893b6c3db2307f8 SHA-1: bc76b9cf1732680ae4e3b7d6630d05113eff39c5 SHA-256: ad196f921af359274421b8d55da63795d8fe24aed455783af296c78478df2fc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a tactic to distribute malicious files disguised as legitimate downloads, such as 'google play services zip file'. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the phishing and trojan detection by ClamAV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=google+play+services+zip+file+for+jelly+bean PDF link annotation
    • https://takipcisec.com/calisma2/files/uploads/zaduxumivasofakukexet.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7db4a25eacf3fb5e6527a96f94c4478c/73751904204.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/93153634900.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/dikaxesijala.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614398d8e99f3---risinixomemuj.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/witeminamun.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/49965564181.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/18290326503.pdfIn PDF document text
    • http://sksound.com/userfiles/file/1084801489.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/35638483440.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/weketukakogapakemok.pdfIn PDF document text
    • http://skene.es/userfiles/file/ralebediwegozofodusu.pdfIn PDF document text
    • http://theponghop.com/upload/files/pujirogefetelezupi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161425e87748b9---54979664990.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/welutuwiwoz.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/nalagapip.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/ralukarosiwase.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/dumadovo.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/jozijobupirosuxijijizobi.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/11638174457.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141a2a1ccb48---gezuf.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613819e61e7da---11822604022.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/pajusonutufojobe.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/20886398117.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/wikebesuxumixade.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/xurukumi.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_off0000cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 17364 bytes
SHA-256: 4a2939473dcbba4ed806ce8a2a7182ef2eb23d01accfbc5f00e9b1203f25f7c3
font_02_sfnt_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 11108 bytes
SHA-256: 3899e3a187ac17208d53eaf365da8448230035b5111b9f3dd5502c4aad817eba

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