Malicious PDF — malware analysis report

Static analysis result for SHA-256 275ad54a11f5c124…

MALICIOUS

PDF

86.1 KB Created: 2021-08-15 04:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 892866afa14c20a397b134393365982a SHA-1: de010113a746ec0a14c5948cdcd257372600b601 SHA-256: 275ad54a11f5c124eadb163c41acc8cfe29939f117dafa5d2683f1e3856a4c2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The URLs, particularly those pointing to 'formcraft/file-upload' directories, indicate an attempt to serve malicious files disguised as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dfd162c25---tuvod.pdf In PDF document text
    • https://louvre.lv/res/wysiwyg/file/309808756.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/2930b4ce77r47dgnq4on2ffadg/23800717501.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/94607678973.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/mutexuko.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b077c6068b4---52136584839.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/mojubexiboziso.pdfIn PDF document text
    • http://iworking.vn/uploads/files/mewarivedixupazu.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/kafel.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/joguxobal.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5b5b05f2d9fc0a2223d7f6c61bfc5321/zokojojitarifu.pdfIn PDF document text
    • http://praguetransfer.com/files/file/ripukubugesanubamugotufum.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///29962090201.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/559ae5ca0c8b4f0810a9b95c9a16541d/birofajibopile.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e1b2063b6---basekuxutotewubugifuru.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9198cb524f459c105483c025781f5f53/wogasuxelawibexegogode.pdfIn PDF document text
    • https://badoza.net/userfiles/file/52550096154.pdfIn PDF document text
    • http://builderall.info/userfiles/file/baxuxikixivaxemawokonar.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/31961315137.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082697552210---relodamewoxamatugulu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/21531486260.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/furuguleju.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/muxuruzupemivuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=protonvpn+free+download+for+windows+10+32+bitPDF 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_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 17116 bytes
SHA-256: e8a4fb82102d6d39fb28eebfe824a618cf2ae84cb827f0cd37f5d0a5334f1314
font_01_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 11252 bytes
SHA-256: b5c4b5332d0df86290567e4042a3753c8a37f0180471d3cb3953767363596eaa
font_02_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1