Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fdfcf5937299c03…

MALICIOUS

PDF

101.9 KB Created: 2021-08-24 19:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0053f7f926b9af0fdee5af2b318fd7d2 SHA-1: 393e5fd911fc1de3dfb255c7b1b514eb9fd9ab70 SHA-256: 2fdfcf5937299c036922188538595c33e5314d6b954011f3cff8b3aa87d62215
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs that leverage embedded JavaScript to initiate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://foodsafebox.com/ckfinder/userfiles/files/7756435393.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607987f85f2f5---49544531510.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b42af39ec8f---67588118986.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/mofax.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb482dd0bb---31668755950.pdfIn PDF document text
    • http://focostrade.com/files/20210627001819.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9rh4djtqbjqobdqmlebsc38je0/jagekabotegakovopalaz.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/budikefetikiriwe.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/oalpbsmbo2cel1po35t605tqbe/44480208515.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/pidugobofukatilubusovuf.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c11206d0bee---14564866602.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c605ebf960---wogolekevim.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffb15d649---rejosopomematubedabipeji.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/96287661021.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704998a8a6c---81010746760.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/91393954571.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/xusejudolulebu.pdfIn PDF document text
    • http://fygl.net/uploads/file/04102740111.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/batijusomuduxodit.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/xaxenabowejiter.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/tezurosewudakuzepuke.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/58153627982.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ou854gjq90o5rfm9l20t9rngtm/rutir.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/l5bf41br4hp2aj4uqt93tq593o/95087120578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ac+odyssey+shipwreck+cove+ancient+cluePDF 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_off00012cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDA 16576 bytes
SHA-256: 41bf903858a8cef6637e659c3572aaf75f5802ca2d2dad6f08c9fb89f412b971
font_01_sfnt_off0001573b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573B 11048 bytes
SHA-256: b4c13c4dfb76e59bd0bd98251e5d02817b5601ba6f475a39eb23437142a02dfd
font_02_sfnt_off0001710b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1710B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1