Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbf85b793fa262b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 01:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2010b27d8874fb0b01347b184299418b SHA-1: b2f0f9090df8a25f0eaff919ef31fec2f22e3b35 SHA-256: ddbf85b793fa262b94c77b4dd2d34efbf48202f83c5cba5bda7f7ee24ee34feb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. One URL, 'https://nomylo.ru/uplcv?utm_term=tower+heist+full+movie+123movies', suggests a lure for illegal content. The presence of embedded JavaScript, though not explicitly detailed, combined with the phishing and trojan detection, indicates the PDF is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://nomylo.ru/uplcv?utm_term=tower+heist+full+movie+123movies PDF link annotation
    • https://alley.52886.tw/uploads/files/70821687530.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/lopevopukototu.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/mejaroturowed.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/51299290430.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/61938947723.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/riwitu.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/56746043384.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/12982650688.pdfIn PDF document text
    • https://pindimana.in/uploads/file/mijeviribefo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161368a5fb3036---ripelawi.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fuxekexudufefuxevuripuwak.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/6730745585.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/walulopofosexi.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/dokafosidexolam.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403c1730ee4---bupuputi.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e3594de7a77d0a700ceef9129a3e2fe1/10687885307.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/zexanedupafezemefonowi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2b305a507cf921ba944112ca90f250df/78711590874.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210912/0400457895.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/0sv34qgm0g1dbrl53u4c1kloj1/lubomido.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/bonuvabuwugujo.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/74288872866.pdfIn PDF document text
    • http://bankerz.in/qpic/files/30626833392.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/69608619981.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_off0000c295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 10772 bytes
SHA-256: b08958072422806d5cf9d1c6b996de1ed6843a543159b1d0af232e7aec1b0cc3
font_02_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 17744 bytes
SHA-256: 459a263f3050df1dadce34a6575f51a0d3fec53e3847db0e91bf306e12764390

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