Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c8d80d542139e7…

MALICIOUS

PDF

94.5 KB Created: 2021-07-05 17:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7bf643315bab1e140127a81ec4a40ea7 SHA-1: ef52d807485cc712a3f63fe6f9c25acdba79e672 SHA-256: d6c8d80d542139e71fd2c60f0006756e0aa28693a0e1fecf20eec8470a6c6206
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 distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://uamarkets.com/images/file/tapadirojaz.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0c81a426---55813976349.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a084c0f4dd---feguparalilonuwajumadulup.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af5d6a6709e---bexeduderepidotiwimidijuw.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d4168ec3b---8292050297.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bsa6ukqt5u8tv5dus77v59glh5/poperipa.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5736a2e618ba66989c71fdb35980a028/sufafifu.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/b7u1faiussivofl4t8hohhcq4h/78910226993.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2o8j5537tje9i6oa6lq1vvel0q/korudu.pdfIn PDF document text
    • http://farashimirooz.com/files/13216326217.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5aa0dd8bbcf8f2a7eb631f9b04185619/78256852633.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe652ed65---larujoj.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/25526193043.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d2ab7278---sunowuwefiwasekifoxovir.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cc66e13b8---ralofojazigiwusiwivejeb.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/fae95fb88ac89a61d5f282b47dea20fd/pububixeroriletub.pdfIn PDF document text
    • https://wecareprogram.org/images/file/fosubufovafelazagavufa.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/671eab0c6c31829433f8c4e503949cff/muraganaripo.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/35749039842.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/kenejusisurepifumiwix.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/62861808088.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/kedubexozuwon.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50c427524---14401457390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=headway+5th+edition+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012b97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B97 22016 bytes
SHA-256: 276c60066dfe263242a42dde5dacba8539d72391b11e769250fdf7728f59ddbf
font_00_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 20816 bytes
SHA-256: 7cb017212c1576983b5095aed3474adab340c4d3849c60d746ffc04ec7b59a0b
font_03_sfnt_off000152a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A4 10608 bytes
SHA-256: 05259c874c94b2840cf21296d67c86efd225e8b08270e3e313e35a820829b9e8

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