Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb170b50ac31a556…

MALICIOUS

PDF

115.8 KB Created: 2021-09-06 06:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0dfccf9c33de07fdab5afa7e31324c15 SHA-1: 0047a682b8d537ade924105c80c78a1a63cfde8e SHA-256: eb170b50ac31a556340a2375727c7a519b0e7ee1015ced60da4e1ac259d15ded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS upload directories. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of numerous external links suggests an attempt to redirect users to malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/39502e9db20b52daf67926c94244e54e/44450570488.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf01006cb---61530157441.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09673720b---titozaludasururafibes.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5c6b9759d397d75409dc7781482a50ab/5210146881.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/jagize.pdfIn PDF document text
    • http://amandamaitland.com/images/file/74800247547.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/86977432471.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/86642422911.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/34670920560.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/jrgbcts8muijlfe7lfjh15l429/raxolojarozapavuruxazelak.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/xagis.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c442246f654---75747749485.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c80bc8c1---tugizaranafavuzopanerodu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160748438d2ebf---24315575894.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/5164602135.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/lofuzinojerijomome.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/29771374922.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/fedotosixu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607072c27580e---mivutivoxipego.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/96994849126.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/zomulofodebala.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/50113928352.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/zunuzegifoxiretifixis.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9322f2e1fd0e4da3277ef14ea649a6e3/zopatibi.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-21/20210721184600748064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=semantiki+ya+kiswahili+pdfPDF 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_off000162b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B1 16764 bytes
SHA-256: 24f35733caec18384bd89025ab91caf6cd9c58fcfe343ef357bb46c1c0706d13
font_01_sfnt_off00018e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A69D 10912 bytes
SHA-256: b71348f798bf0ef4f9c7045751614c287c82bbe3460940fd6da3901fb4b5621f