Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8fdf04af5cc44d…

MALICIOUS

PDF

104.2 KB Created: 2021-07-18 19:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fe1a4425eb276088b73082f329d03ae SHA-1: dad0e6323186899918df9ccfe70ee627b6283dcb SHA-256: cf8fdf04af5cc44d60b5b70273b98246e3c2568e772dab5514307c2451d1d4d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1491502fe8---14096880340.pdf In PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/nijitifowuzikinasudore.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c453aee3c0---46597458627.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9a144c4f857d8b54d36a5e20ca19bed1/19369852810.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85404aff20---xuzepimizumonorekukaw.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160841d9f1ff0d---21656314948.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/53001679776.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/97111dc12f534053c68feb01017ac2cb/88245583987.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/wezilomowa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/9578836545.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a97d837b3308ab62f4c98e801f9ebcde/xitenupokudirovisi.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/xelibetefu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07e8fdfa22---81480515013.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/65736438264.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/lajatururi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8813d1e231f4d4713f277c9218806611/66539110507.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///42981517522.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4415f6a731---gurerurivuput.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077213139298---1600388205.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/noxezujazaxokus.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/97280239113.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6a8367a8fa6305468d5cd1c0063eb631/45147514123.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b724a40e6e8---mixukugogizuto.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61e442f3a---wideruninipemafo.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/60979612986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=words+beginning+with+verPDF 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_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 19672 bytes
SHA-256: 545ed9df631a15e2a729517e2a7ed204180cfeb901cdcf69854120a83e6e8aec
font_01_sfnt_off00016375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B8C 10604 bytes
SHA-256: 64526d6b61231726db9476a0f78799821fb8ba001f9e17d9204f824e24a1dfb2