Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcb303b8fb24244…

MALICIOUS

PDF

84.5 KB Created: 2021-08-19 19:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 060ee23111cecfb780abb02911ab106e SHA-1: cef6b30baa23a18146b77f87faee4f6211190963 SHA-256: 0fcb303b8fb24244e37c601c3ac4c6527191ac49869859d3e10fee4003812669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The primary goal appears to be directing users to potentially malicious content or phishing sites.

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 https://bloc-immo.com/images/vigob.pdf In PDF document text
    • https://burstallconrad.com/editor_files/file/puxujexogakodidej.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/vumerarozumarexifemekabe.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/8323018446.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/61220816427.pdfIn PDF document text
    • http://tp-pos.com/uploads/image/files/51242169545.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/49802641403.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee00ca686---26796459334.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a753ae5a22445af4ec561617b759effb/22349900485.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/maxipuxegizubuvuzu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/7f1de9831d9f8cc97748c09b862034ba/koperarebomodufipaxefojan.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/22623891848.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077172244624---govekadirukuzifujidajezo.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/goxamajitawaxa.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/426c8b5f99ba8b0ccfff392e0a2f38be/weletapuselavatebo.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/16140185433.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/lamaru.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/jujunu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fbb9c58ac72a7ea81c60453848bdd755/xutojumumagol.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e91da5ef65a59c9e067e0d109811683f/54862121817.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/715d8a70161e9ed94173b1eadb5351b7/fipevifavibuvagixet.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/tuxokolumuluwiwupekunip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+carrie+diaries+season+1+episode+7+watch+online+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_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 10868 bytes
SHA-256: f1f3b3d6865137d8ed9590a7205545c76e64a6c2638051990cb7a54c9509b74c
font_02_sfnt_off000115a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 17268 bytes
SHA-256: c8b3125c0f18afe9f3bc53cc1a4c055a68b7dc19625ea01f14203a40720b9098

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