Malicious PDF — malware analysis report

Static analysis result for SHA-256 b260da9c17acbfed…

MALICIOUS

PDF

89.7 KB Created: 2021-09-19 04:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f679695aae3a3fb0bfe97afeefd364f7 SHA-1: b32e5d33d7299bac37d683bdeb64f1fcb7922dd6 SHA-256: b260da9c17acbfed9cc53afa3c650183cd9efefd5e0e200e5a8e0ec4a22f8bf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=uppena+full+movie+watch+online+tamilrockers PDF link annotation
    • https://homeuu.biz/upload/ckeditor/pages/files/74868695769.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/55299953559.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/dijuzidumapixowiw.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/18600805913.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/53195715937.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/72752880531.pdfIn PDF document text
    • http://gardatrans.com/content/Files/jubevedidip.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908061007.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/tulajupuweridupaki.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/vekukebiwad.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/danin.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/57345735926.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109032231095497.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bb73adf2c201e481b1fa51b6321b7de3/pitibexexobanotazagewiv.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/beweravoji.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/20172351022.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/4661329833.pdfIn PDF document text
    • http://lejonhund.com/upload/gidevufujuzusotofaroko.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8ulguis5mi94e6r12u2kbe6r0o/ronovemozeguroveben.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd72c144a4---83787711103.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/30982000741.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/zamavinisat.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/59217333797.pdfIn PDF document text
    • https://sinarwaja.com/account/files/bifaxozupikaxelilojus.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/zolamuwozuvajobotozo.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_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 17596 bytes
SHA-256: a8bc317a8680d05d514ca1f4c666c93042842ab7a56b1283ac446b2cfb2f81be
font_01_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 11096 bytes
SHA-256: 1d0ea488d31c2b8bd61db4458ebe2abdb6a7134c9c3f13693ba22338303a7d22

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