Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c6db6cd6d5cea8…

MALICIOUS

PDF

133.6 KB Created: 2021-08-03 16:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d67bb064bd484f668632090f9771fc60 SHA-1: fe39ab948f83a4acc10a9eac365b29c84dd5098c SHA-256: 65c6db6cd6d5cea845b9f43ccbd0cb2ead98a2c28effcd507a71f5c23d4e1c13
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL analysis is sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d7901dd1---nutezemi.pdf In PDF document text
    • http://parfumkin.ru/files/files/damazakidonafagapovix.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d5a3c5860402e39572c3634c1246efcb/79659864782.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/kajadoseduf.pdfIn PDF document text
    • http://novichiha.ru/pic/file/66940266207.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/57451642627.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1625403994.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/83153172943.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/38eded6ab216c90c30b5e13bdd709e07/lopenabetukejebuzoratume.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9bd352622efe050a684f372f922fc7df/43087373612.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4412ec3efb---96313040190.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/51101785254.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/69436824512.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a664912a62---paperadidulowelot.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d4ea123dd---64585473451.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/23563483293.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/66216624394.pdfIn PDF document text
    • http://mousike.it/img_ins/files/92205468679.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/nemeporivoteno.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5ce4d2a5---gaxinunawibufenunisit.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610385a23040a---wufagenopegena.pdfIn PDF document text
    • https://mfdesign.hu/files/file/pugidume.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/xipagulegunijef.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/lj73k77ut8bm7om60vtn0f72ai/26562630440.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/3616873585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ninjago+masters+of+spinjitzu+episode+93PDF 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_off0001a219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A219 19344 bytes
SHA-256: ea986da7ad71df5292280417f5e903ff92b025195218363472bf747b3e245b1e
font_01_sfnt_off0001d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D560 11400 bytes
SHA-256: d716c160fd655ad1a8435bc21733598f6303b4aa4f67b50efa7a6602a9f8dee7
font_02_sfnt_off0001f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1