Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee824cdb164f5cb…

MALICIOUS

PDF

92.8 KB Created: 2021-06-26 03:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e82754188fe01c9fc4d838a3a774dc6a SHA-1: 348c9b31e9e84a734a452517bf6640deb3be445e SHA-256: 3ee824cdb164f5cb49f613c103a2f3991088ba1640a053381b1c4709da366b46
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content by disguising it as a free download. No scripts were extracted, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://medvor.ru/uplcv?utm_term=iso+14031+free+download+pdf PDF link annotation
    • http://lhsclassof1971.com/clients/74120/File/razetefolizom.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/48418775411.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/wamum.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ebc7dedfcbb2a59608adb8d68060a7a4/nupakateradifonegakanise.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9d33246355ea4aaec651d2d10e4c70d8/fulijidisevakivi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a1835e322ea5c0a56f1214112f35fd24/70209963621.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/aqh5g3p6iv7ocud45bo1or6qf1/34476281442.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/79be36a652f3b4a9e1bb0dea84ba817b/70047125743.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/5d07fud0ib6k53n7hlprg5df3o/69883148476.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099df112f448---dagekaduzoketadurubiditip.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/fepugo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608789d442819---muxenipesikumelisoku.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c068a10ce5a44fc059d8c5f71e3d4f75/juzetiboxunudunukevubawal.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/zevawatidovofefotofi.pdfIn PDF document text
    • https://avenue102.com/uploads/file/mipomaves.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/lusapatu.pdfIn PDF document text
    • http://vswet.ru/f/lulek.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070abf2e6ad7---97153283048.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c2eb6b75cd71e2303d85273d0bc66d7f/5323804854.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/38803069179.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 10764 bytes
SHA-256: 6c853c2b0b4c3d053abcb62b349a05446181a16fd1203c8b337009569c6b359e
font_01_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 19608 bytes
SHA-256: a0f6553b465e44b46fe614c5bb0244b11fb97de90cd9b95b8305e92a49f80509
font_02_sfnt_off00013241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13241 8628 bytes
SHA-256: 262832362b6ee6d4adce0df1bb708b299b3c6c39db581c1824b9aa5106560980
font_03_sfnt_off00014dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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