Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b393832b39e6da…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 12:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab91e6121dc11bf53a0b05d543a0245e SHA-1: f4a30835be8fc03e97a9062c4559348be7652c52 SHA-256: 80b393832b39e6da406016e980ac0bbb689e05b4247f5ed96a980da9ed5511b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://studiolauramoschini.it/userfiles/files/jefokigenivivoxugusa.pdf In PDF document text
    • https://bluza-shop.ru/content/File/18323006689.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa9febf5e5---2270873107.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/50858616343.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b85c0e5553---9343644582.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/793dbe122d600f83de8bc3c9bcb2b98d/23762486429.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/gajebanepetalibejamu.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/61023603181.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-5/20210705051236157597.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/20813376300.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d010da56ce---83531631481.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a0e28a34---11255793968.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/63629600378.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4g182i9rs5un0jqsc5lqvpmu97/nexef.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/rutidojiwagilisometo.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/33878092423.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nafajezezoretufo.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/46429927710.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/18804664338.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nuxerime.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vhldqmdsfe1ovuqe66eq5v56bq/56522293623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=separation+of+powers+in+zambian+government+pdfPDF link annotation
    • 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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 16608 bytes
SHA-256: 8f1f054523488574c28ffef947fc7e34e6b93b674a2d624b017258cbae9e69a5
font_01_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 11224 bytes
SHA-256: 19d6426fbbd576bf623bf34686681e13b1ecd00aa702809dd0d1dc6b67d4bd76
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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