Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de913cd4df28824…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 17:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99513b2defbef1074e7d8049a489af10 SHA-1: a5938a333867f03cb88f9354d0960a2b5e322578 SHA-256: 6de913cd4df28824efe19f9a6c94f862c8d40d423bda6bf35b64431204ddf79d
164 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=human+physiology+by+sembulingam+pdf+free+download PDF link annotation
    • http://grandp.ru/userfiles/file/taminizijegevatulo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c75c9469d84c21bf78d856bda9c12d5e/68025897746.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd522e5f8---50258742485.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/ep05lgaqujf5ks6peibe84a65d/levujir.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/aa7feae301132a14311b17ee4de3e625/zorawejugatubozaletodor.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8bffc7159---92799940219.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/5414669344.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/49332309511.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/3996389445.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/33973040305.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/82351413380.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/bukeje.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/kotijuxibakibebulalasodag.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ed8dec6468a2e7e546a4d4c079a4005f/39221332500.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/55158083580.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/31105400010.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609d00188ee1e---vilolijem.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/99237526159.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/netuva.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/xaxivitanefereba.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kimoxiporerosuvex.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/zurokanukigozodesuzubupe.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae80b2d46de---dupunibus.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_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 11276 bytes
SHA-256: cfd583c36b52b6e8fcd966c200c2abf9817a54abf22d88fbffc53627d7ca51f7
font_01_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 17772 bytes
SHA-256: 835d147704d013bc64b399b9926e506602697d2b3d728c8f18c65f26c4fd3ec5
font_02_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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