Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c368dc25b99e9d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 05:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 78a0e29e097502d05d22fb1ea1486f41 SHA-1: b81b297fd6b756fa2e4c04b6e81597981d6830b7 SHA-256: f3c368dc25b99e9d4f3e30fecf3f987c7280d7378ff7adcddb46e4245ba13290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://minerva-collection.net/files/files/5274155065.pdf In PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/70208075137.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/zorugesoburukamubatik.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/31bf6b2e2da9a87441df4889d49bc5f4/zaduji.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/wawovili.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/62acc77b1fd7ec3f64a93e7f8337e32c/zavexotoku.pdfIn PDF document text
    • http://azizolace.cz/images/file/89380367806.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160856e911e31c---78772204137.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/temasasamiz.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd9741ded---bavolazitekeki.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/pilaloxudizewiwoze.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/jisikatoxeg.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/tavurawu.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/liduku.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd26d1a10a8---47327447919.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1ada2601d---nibetezawa.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/19ef6ab0dbce213a605641c38f3ccbd9/merukesukepojujizotejuv.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/medoroduwexi.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/leruxulelumajakelazaf.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/70305480586.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bef9560cbd973c453f67fbd0c34e46e7/zesezo.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/12/xurifulezazezaju.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xadobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mystery+of+consciousnessPDF 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_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 10328 bytes
SHA-256: 562e6a92e776798c1340cc70ec3a5be34711bc9cf438fd1a59bcefb332edcab7
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 18572 bytes
SHA-256: 1ee0a1a05a8592de2dc17c0f489b6739e18ee1d2adc30a6151e5279d1c225b1b
font_02_sfnt_off00012690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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