Malicious PDF — malware analysis report

Static analysis result for SHA-256 09039a85256a8c89…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 21:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 513056f185095fccb896fe7fe8faf285 SHA-1: c70685d34f824e8c8bf64a2c67cf177f34500c3f SHA-256: 09039a85256a8c897ff70a1e7f0fd4e3e1aa65a6a55e875af962e13b1072f4ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3e7fbe97c2f4386812745a98761b4fe3/foxenibekuxojuje.pdf In PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/1425520968.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1548c63767---99570380428.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/3e7e38621ebf204f662ada9ce63b4bff/28458838420.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/kirawopubapaxep.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/manufafisopamurevanukaf.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/nawesa.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lipodabalovola.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xotek.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/35988916440.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/jevusibavemudavegal.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/jabitoridudegoposijipax.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/jonise.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210819_997C42AAF3090F1F.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ea316d92d06c64581b8a1fe7754574f9/16712518223.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/3ocdsm7s0fk0dhseiv06g2oviq/velapawemamepukinu.pdfIn PDF document text
    • https://rotitelor.com/contents/files/rudibugazu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5197a115f0---81977749270.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/1a5b44cab047c5fdbf9d38218f44ccec.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/72021368192.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/29283610840.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70fd72e25---kotumuxogamemirusaposuv.pdfIn PDF document text
    • http://mutitar.com/user_img/files/feliditavepamopide.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c315d7096---gavisinawitizevemi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48b496920---vixudejipoluxopunes.pdfIn PDF document text
    • https://aokman-drive.com/d/files/pabotiluzenapema.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8ccc639f---28749848636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ae+9000+manualPDF link annotation
    • 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_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 10060 bytes
SHA-256: cdd58f1c23179b22fca1a5d1184648b1133a0891e348deac7a94c56a30532c80
font_01_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 18184 bytes
SHA-256: 986e1bafd26bd3c2693da46c0eedfbd94d3b2c7e8379c7d5c3a64bd797751184
font_02_sfnt_off000137d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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