Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c117561be761dc…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 10:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8b59a8729fb41def4272b499391501d SHA-1: e218645c981737a3df49fd06eeeaa3a65f9b743e SHA-256: 92c117561be761dc0da02a2906160d33425b3e13ea454e5f9f5c0f2e2cd9eaec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple unknown URLs suggests a broad distribution or a sophisticated phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911b8385b45---sevalarefunabofazoxuni.pdf In PDF document text
    • http://clairvoyantinfotech.com/demo/images/84929122334.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7u023vavnddl83054l1n79oamv/poloxotapefajobubeju.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086245551bc9---pukod.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/xafumolumojipujokazipe.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607981e666014---difiwovoganajav.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/14901451943.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/9732138646.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/65di3hpgma0srqfdcl76828c0d/56586896622.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/42e99c123bda5dfe92d264c3ad739d44/gevusiriwovegikoz.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/xapawidusubememodibalok.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/18ruo25eithjjk33g8de7h4fmb/niwivuwa.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4as8fcrbhk1rppp7ll4depvbq8/61065851621.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/41401089807.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/fabavabebawujeliv.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/gimupesizur.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/jofoxinelazoxako.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/95868802854.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/74422653661.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b76a24cc---14943704905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=interview+questions+of+electrical+engineering+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_off0000d5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 16496 bytes
SHA-256: 29926e92bbd0bdf27f70502613a284b891dfdc2417b58c4b1b5fdee3fbaf7d7a
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 11144 bytes
SHA-256: 656679fddc6b2b45e893f756542c8c78851e67c6070209feb3afd28e852b2929

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