Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4b43a0b5290dfd…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 23:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b129c8291fd42992e62c632cefcf16f SHA-1: e449987cf59b0925c9ac0f67ea616b2c5f426fb2 SHA-256: 3c4b43a0b5290dfdb6564211ffec5e0b3eefd6e44329d89fa4a0d88ca6f5a5a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites, suggesting it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL findings are sufficient to classify this as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=gmat+percentage+questions+and+answers+pdf PDF link annotation
    • http://eltprof.ru/userfiles/file/gatubunate.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/08d8d2910ca4a20e2c479519c7755343/pukusoxapazugurigi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/fc81b1e8b5db96272cabebfa6c0cd013/mifuxisosezatalipe.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/kekepeboxivubasuril.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiriz.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/fafifenomupexaxozusitik.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/50151021556.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lpd6g3qpl4g6tovmn37s2j8821/ludesakaridonimufivigebo.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/gofopevumosisobodesed.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a41385bb9e8---gelepafibevovowufofirive.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/63992343820.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/dekisazedumeroran.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/tocg51ladr2qm0frk7fq3ne6f1/58930601370.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/zulasipek.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd121c13001---61846588320.pdfIn PDF document text
    • https://fultoys.com/userfiles/93100288380.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/widuxuvilogofivigatovuvuk.pdfIn PDF document text
    • http://espokebar.com/uploads/files/xeluro.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/tikovidapojigavopusuline.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969a15493d7---59472447027.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/nuluro.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f724e5e8---faporali.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/90590240312.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/livixapazemofu.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/8093462759.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/12788459758.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_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 11288 bytes
SHA-256: 758450d44197ed9cc67476edb1b3c2e55c18cbbbcd6aae8d302aa4b3dc1cd748
font_01_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 20124 bytes
SHA-256: 37e6187fdd80cdb90eb9e94a9c2905c313ca2b91f7d93d2f62832a4eea4eb693

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