Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ebf9c59b48cb7a…

MALICIOUS

PDF

73.8 KB Created: 2021-09-08 11:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0290bbc4ac05a2cf58343c68e0771163 SHA-1: 1417d6bc38ee7400a8ed6ce7dd5f0a44b06914a1 SHA-256: 49ebf9c59b48cb7aa2c224ab473e1dda6b1ef7ecc6412a696eca73c1fbd4e108
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://korean-school.hu/hangul/userfiles/file/dasira.pdf In PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/e80c6f103fe93626a165bfa497ec3b19/85473266317.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/13893883318.pdfIn PDF document text
    • http://surausa.com/uploads/files/witasudab.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be048ac13ee---gomaz.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/vodufasi.pdfIn PDF document text
    • https://domilot.com/uploader/files/24144555637.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/jatonamodozegegobopelinen.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16120ea150a02c---dawaburiluri.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/jurenobigovunuputojile.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/97299198060.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/53568220614.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/66618177750.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3245623584---77878804333.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/7423906639.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17728998b1---kojunav.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/56043809145.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611e28ada79d7---surupazezulu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8878123f02---10741920284.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/ponejeze.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6b9si8unuoo9k1kc52hm6v7q17/31512574741.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/mokemufagobazal.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364ed49e217---74930194258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=matematicamente+modulo+1+pdfPDF 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
stream_002_off0000bb37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBB37 17712 bytes
SHA-256: b03cdaeda2f081366e96362146c1bbb63aa1ec644c591b482611545bc418b4ce
font_01_sfnt_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10656 bytes
SHA-256: c270e4bff50e967e76d259dfd2932c18d188f1e47c3f1b31b378c94a8d6dbc2f

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