Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d34a1cef7d8570…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 06:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fc2953a6f0a05db0e054cc76064b4ac SHA-1: bdf321a246c935caa35cb294b48f7e2703b424ad SHA-256: b0d34a1cef7d8570a082657cd83a192c1f52ac4da7df39aa6de89dbdc736112b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are designed to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://studio5r.com/userfiles/files/nevadesurigisofivifise.pdf In PDF document text
    • https://akapacha.com/userfiles/file/lefewotul.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/denarujototututosuxutama.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e47ee40c6---36675963189.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/lixevepaka.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/65761475.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ff1ad4357---49543345674.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/68709570636.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16117edc7e2162---lozufuxorotepakuvi.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/mozodifivenefo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609422436113c---farikimamufol.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083d17cbd94a---62952925319.pdfIn PDF document text
    • http://ellev.fr/upload/files/giguvapidekutikej.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/tazaduzeluzilaxigiluvidet.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2hsbd5j6vkvib57d6a75ugeqg5/bokiton.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/xavaweno.pdfIn PDF document text
    • https://bio86.net/fichiers/5591927532.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/94687d220a14b04ccab75fb5de62a36c/51682092581.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/gegipe.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/kamisorizotidiwoxutike.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/tixivukorega.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/julorus.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/81369814656.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/384d9d9b09d9ed0a229b7eb652f526eb/zinufat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=libro+el+alquimista+pdf+descargarPDF 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_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 17932 bytes
SHA-256: acae36daedbcc7c2b0484bdd7d249591c86faef4a34af4210cb2099ee6a7e2ef
font_01_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 11204 bytes
SHA-256: a032f07b3eb8555edf22be9308f2af09a9e71e73d25b5d4f082333cfd27e2e7d
font_02_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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