Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b05da6b84f7258a…

MALICIOUS

PDF

92.7 KB Created: 2021-09-07 19:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21402f487ed54c2f7380c98da29b270d SHA-1: 6de160c373f15062e95c674935828c85d9d54a2a SHA-256: 0b05da6b84f7258a266cf25324d7962193869564b5422316c7c4595d581f836d
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 CMS upload directories or disposable domains, indicating a link farm designed to redirect users. 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 0.9965

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://garglob.ru/uplcv?utm_term=rule+of+law+philippines+pdf PDF link annotation
    • http://rs-entp.com/upload/file/fuwudi.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/tidafovabopikofefavola.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a627fdc889d---ratawafikonakugebi.pdfIn PDF document text
    • http://allasclub.com/campannas/file/nixiloxuvi.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/kiwijemilajegirak.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/xanofo.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/zexotopilufugagima.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/82709879577.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9b92101a0f22d91e353568fe00f1a6c7/14006053928.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/48e84a087e1b20ebc9954a11c7ae594e/21595712679.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160731a80c3f03---gaxavoku.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/75cf88e61d3d0b2e1f0f125f7a4370a8/59328853354.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f968b0966---lusutijapeladisozofasoxu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e7187f95---jojipasa.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/26954ebc2f3e4296ac6059c0113485cf/jonuxoguximix.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/90a9cfe591650f7cfe19376607810d21/89804159395.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a91840d2536---kejonorixi.pdfIn PDF document text
    • http://becucci.it/userfiles/files/kepolijerewodesopipomere.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/nojenafup.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/lufinepurumenosigam.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/q6is4g28on0pd4fvldr24pta3j/80421431557.pdfIn PDF document text
    • http://chinahongji.com/d/files/51912406896.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b59abf91424---rorivibenemov.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/54438995752.pdfIn PDF document text
    • 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_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 17600 bytes
SHA-256: a953911ea4f5bb728af2b5ae9d2c327f28a8454ee31dc1de1033b310c94c9ff8
font_02_sfnt_off00014c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9C 10628 bytes
SHA-256: 26923554a8351b782099e1e1d4408cf43f17e015c5a331f7304cc400321e8256

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