Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c66248fd7335a0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 03:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96f9edee2c43b353ac79009cb0862825 SHA-1: 7c520b5434c1e4cb87887582a3d69a52798eb212 SHA-256: f3c66248fd7335a061464ff7d9685fd957d16f8c37e7574ad7475d0fcf639eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://inwebjor.ru/uplcv?utm_term=47+meters+down+uncaged+123movies4u PDF link annotation
    • http://hibertek.com/image/files/20210905_051059.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/mamowigufol.pdfIn PDF document text
    • https://people11people.com/uploads/File/sodirik.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/zeladolavapajut.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138205db12a0---kevarukowaruwigupegij.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e77a5ef31---visizokuturokuv.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/46747236742.pdfIn PDF document text
    • https://matricula.arendic.cl/files/nezelokuviro.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/31914357607.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/wataroledalegefa.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/sapobuvejokuxizisexizi.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/sijepanakaxavu.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/tiwuxilozur.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/21987292727.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/1254164270.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/xopadituviduvinurij.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/vibugevamazafa.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/piwunu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5a40f9c1---53822557271.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/87620490582.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/zokemeb.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/munafidudotiropipi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1fe77c2709e4ab6deeebdbbaec4726b7/46834020440.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/65299022109.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/81859631507.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161389bf8442df---67495878909.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/94669082085.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_off0000bdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFE 11296 bytes
SHA-256: cdc646385bd4ae5a39858be579f7b1b97354a677f6de56a257c12b236f3f1b31
font_01_sfnt_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16240 bytes
SHA-256: edfcbc04adc159eaf82802ec37a8fef67cd5e73b61fa74776d853e2b8bf75c25
font_02_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 18056 bytes
SHA-256: 2acb2e54afb03f1221a801b0f27cfaae638cdc0cc724d9cb5506e510ebd52917

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