Malicious PDF — malware analysis report

Static analysis result for SHA-256 b676696c3bd0acf8…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 14:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5684009750298c6a8e7c94de4be70bb3 SHA-1: 5ed865369450b83e574cd2225b31531cc578085d SHA-256: b676696c3bd0acf8990db759fc3013974efc198bf0cc69e36a5a5e3a0c0561d4
104 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. No scripts were extracted, but the overall structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=sleeping+dogs+definitive+edition+cheats+xbox+one PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35b07f8c3---79320704543.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/56905710197.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abe7afc9552---zoterezevuz.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/21600632771.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/af3b91243787d60414169dcaf368a0e5/38417223022.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10bca85b96---xudapizu.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/famoxivifewuxezenin.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/nubotafasixak.pdfIn PDF document text
    • https://maclashoes.it/file/89380616777.pdfIn PDF document text
    • http://aven.su/userfiles/file/64399530464.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160abb996aab66---74945917279.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160840ded60a0c---28478693111.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/93412276310.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/1791754237.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/pukugepatowipekakir.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1cfcc11efad0dd5eb7e87f1fa191a1dc/wuxitadomo.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d60a3802545---fekalenoz.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/udabco1imfmdt15bs81kdn8uov/taninerixirijaxitokol.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/0ejs7jm0rs8miv43cmqpsb8phu/zavepebokur.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608421b92cf8c---85916593562.pdfIn PDF document text
    • http://bjjiffy.com/upload/disukepefa.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f682110df9968c53838f65af07f0423c/judug.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_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 22168 bytes
SHA-256: f68378df563c4e0fc0c0d2c7bdb69ba9505721a7dca30f3250295e4798394bb2
font_02_sfnt_off00013d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D06 11184 bytes
SHA-256: 562b65d303186f7ba8d23ea0158e86e358d64b2fbc4d1ba8f225ae5666e8ea8d

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