Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c432a71ecc5cf8f…

MALICIOUS

PDF

76.7 KB Created: 2021-08-16 01:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01ac2e063cb71ca9e61548272c1ba35d SHA-1: 8a04c56b047c5b13796f84f04fac2b30fa87f9ed SHA-256: 3c432a71ecc5cf8f2fad467c0c2632ab7e93880fe8b628aaed351cf6dac036b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to other PDF files hosted on compromised websites or disposable domains, indicating a link farm or distribution mechanism. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the links suggest an attempt to lure users to malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://krisoc.ru/uplcv?utm_term=answers+to+saxon+math+course+2 PDF link annotation
    • https://itacademyindia.com/ckfinder/userfiles/files/gupilotupomu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/susifaponarevobi.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/lorixova.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4f1b4ce2---6592277295.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80f8e6ae41---19978827633.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/84f4f00f165a8f461fb36ead310594bc/60792834952.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/49038630678.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/donigumoz.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/77986394285.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/16971f69e3a4c6299e1c80d28a5f253f/70216021505.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0a16f8e2---8501511176.pdfIn PDF document text
    • https://actor-conseil.com/files/file/26298490110.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a16fdc185a---zudizuzi.pdfIn PDF document text
    • http://keramann.ru/uploads/files/wokadolinu.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/toxigenubebegedowuxumog.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/65329793462.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abee4e5d89---gafegirikoturavidi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2pda4a4uf95e7ocer170d8to56/19399140881.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f3475cc1---dizozopedawudutimiluw.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/29597024241.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160849a5e1e774---87409101246.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/78273294453.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/zirazefe.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/fapetigenubolizodesirix.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/otj5bk057p9eftr821ahko09ep/pekugaromotimebanipebol.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_off0000c7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 17104 bytes
SHA-256: 6893ffa1dfa7fad400b2d383d6032efad3f681dd15f7a62aaa9a608de14d9c84
font_02_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 10744 bytes
SHA-256: e2e5b90f47af46dfb0c68da04c4e739e16fe53174e8f1556f4f888015b5a6acf

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