Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ccdd37b3e668ed…

MALICIOUS

PDF

85.3 KB Created: 2021-08-31 11:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 99a159d2cafa15ec1e23eaa638a6c9c1 SHA-1: 44b9b893eaea34b162e94413477a4b040ecc3849 SHA-256: 76ccdd37b3e668edba9c85c23b917197556bd6ef5405653279938cc206dcab5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links pointing to compromised WordPress installations and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of embedded URLs and the nature of the heuristics strongly suggest it is designed to redirect users to malicious sites.

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://pixomot.ru/uplcv?utm_term=sexism+for+women PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f311396e2---zojusoduxoberazolesanoj.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/n130ag3el8flm7o1kmjf23nmf6/nuresunilavam.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b3152e196e3---zokogola.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/pekogikigarokelotire.pdfIn PDF document text
    • https://securitydm.com/slicice/file/28155609533.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/84879011048.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/vitusuko.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/toxam.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/05m8o801adf2jhhgc6sqfo8u16/25940544538.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cb3f5541dd---rorozotejorosajadipasota.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f4bbf5df---lirobutodetojukun.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/22081545938.pdfIn PDF document text
    • http://df-2.de/images/daten/file/90756135117.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/26000213835.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/70f23a273a404429cdd94d3915ff33cf/21502730705.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/nidubesorabod.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/55542566287.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210730052622.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6bed10b917c82abf21d3cb575620be26/zogorira.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103d63c24864---wafonirikabozosol.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/fumiv.pdfIn PDF document text
    • https://vestol.bg/files/file/rilel.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160adc11919570---63781926612.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/2495879427.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/bn5m9o4sd51pmldv8oophirne0/pujokesifisadonaxifuv.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_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 10332 bytes
SHA-256: 7af7547dee016050ed6c582b549f6fd35d8f8ba7d4da4d7286b61949ff2d374d
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 18088 bytes
SHA-256: 05bf523fbd3621094f676a8094925c2e33911aff94df543e42cc3426ae5809ae

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