Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f311cfa10f9bf17…

MALICIOUS

PDF

91.0 KB Created: 2021-08-17 07:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e244ad5e5d35de2023a7696d1a558a08 SHA-1: 769a7c53785935d4aa1b3944e6b4567dca079b70 SHA-256: 9f311cfa10f9bf17ccdc5edd85f4f22420a02b2145b6a8d6f4cd7ca61165cf36
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution via compromised CMS uploads and disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=harry+potter+and+chamber+of+secrets+book PDF link annotation
    • http://daiduongmetal.com/uploads/ckfinder/files/jijewuwebo.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/xajuwezejofag.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1fac0f411f8ec124ec91a095f8fafcb2/jimekinuzugotomibizipu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bffd855d8c51fb02118a9ee7db87ef5f/vuxupowa.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/5385635383.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/bebdf9edf3f2e52b3d1f0435eeedc8f7/zopojogujoxuva.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/pojr632hsv6c7apalebf8r4gcbbb4n1a/jubop.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611423ee6f057---nakometepujakefezowido.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6b63fdd9f7786062fbb9657b4d324bb7/varijakigevif.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/xorewirifajaku.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/96616778288.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/22350125888.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/adsvrg8sgbaa0gj5q89hvhdia3/65631725329.pdfIn PDF document text
    • https://maisonforville.be/documents/file/xitadizafuzir.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096bd349df6a---77263287095.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b119035a447d7c993bf4b59c64a3b67c/fumurufiwepoxosijokuzo.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/ginosasezevarurajamape.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kf0f5rt332iltm5a0fgtbrf8n2/84549608721.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609036251074b---dixosajerasetapufarebo.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d41830cc9---97614062236.pdfIn PDF document text
    • https://brod-plovdiv.com/images/wosexuwadogevumonugu.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/55464728206.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7c49020d3---38009482048.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_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 11084 bytes
SHA-256: dfdee07b674c3d15f96e4e9e280a99db3d9385151ef855850d1a2d2073a26765
font_02_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 17484 bytes
SHA-256: 19334f77e8c6ac204d25b4ae89877d1fc63050f30d770fae49c9b8822cf01b6a

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