Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a671009a1e9854…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 02:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d47abbfce144934eba286ca5e4084dfc SHA-1: a2030c682252342ebd096d690ea5f7ad1853b429 SHA-256: b5a671009a1e98543e14a1d5d043977ea010cb3b900641b67c3d64f85b23dfcd
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The 'PDF_IMAGE_LURE' heuristic indicates it's likely an image-based lure designed to trick users into clicking these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/53eb666a99338d2bffedb1370b7ee083/rowonujizimadi.pdf In PDF document text
    • https://charterboatdeliverance.com/uploads/files/mejofimip.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/24971712535.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/78520782127.pdfIn PDF document text
    • http://glttek.com/userfiles/file/83983382616.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2089578bd25a99b1d23acc5f6d330ba8/20382591830.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/sahfbl1fivllvdbffdm6sofpr7/29391574875.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/11258314312.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/tepafajivogevowu.pdfIn PDF document text
    • http://chieucoingason.vn/files/22036176499.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/mererit.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/xijanevojevawavebime.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/55209623473.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/61786744726.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/1797976663.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613742a8497e3---mutumoze.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/35896527782.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/56284412047.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/57304563010.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/futubor.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/75852726674.pdfIn PDF document text
    • http://compsult.net/userfiles/file/nijinedezudaludazuzakiz.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e70fe3ab39be5916d9ac9be9a9bc39c9/ranad.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/92963296707.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/60933192757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=web+series+movie+download+website+freePDF 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_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 10800 bytes
SHA-256: 9f0df3832b987f14b4633dc5ecbaac4acd01c2c958eb0447d103415a96dae359
font_02_sfnt_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 14500 bytes
SHA-256: 1db917f15d870942569c4792e43fb9e4ba2d93ff875151fe46e4d5fdc768d158