Malicious PDF — malware analysis report

Static analysis result for SHA-256 722e494f0e20f866…

MALICIOUS

PDF

88.7 KB Created: 2021-08-17 04:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b48fb0553130254a5301d181fb400af0 SHA-1: a3b9f2af20a58f0431ec3dd1c3adf3c1fff9e784 SHA-256: 722e494f0e20f86606b123f7c9588b504acc545ee830a6a02f45985ccf585fb5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://mrbossamktown.com/uploads/files/liluroto.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/75d62534a85c7f1462389ea39eaaa7fe/65368542349.pdfIn PDF document text
    • https://bachson.net/upload/file/nepolasigewapirasisam.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/77044244601.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429172303834475.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e6524a5770deee36e1125e90d20bbe78/fubidibirufeketiji.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82dc700d87---13004920338.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/75420947.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/9758397669.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/vpgd4iq8ehbqf1dn7brdg9349h/16665947712.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/31095663949.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/1387419633.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610eab4de5090---75658000965.pdfIn PDF document text
    • https://bio86.net/fichiers/18012692466.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/89743511586.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/noniziwimo.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/zimiwanelopusuzononog.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/niwafutelo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/452e4bd6eac47c43a151e4fe1e26c8c9/pujabapekoxepujalarojid.pdfIn PDF document text
    • https://triosms.com/userfiles/file/79782912661.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a435f48264---seketijeruzogemubenir.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeb9ebc873---gafeferiregoveloteje.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/dowitiliwipos.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/16699408237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=katja+millay+nyugalom+tengere+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_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 11008 bytes
SHA-256: fe2be74a5c7d41c459843d55901ad6ae54621c9472505da5d27684aec66f8426
font_02_sfnt_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 18924 bytes
SHA-256: d73b689ed305f0e4cc28575a722a37c3062d03c869e9e6e692bfc8f458aa9762

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