Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1ec68b0522c313…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 23:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41979db31ccd6fc17bde375a491d3606 SHA-1: 583a50210bcf2ee9ba81fca67494eec132b8a1ea SHA-256: ef1ec68b0522c313cc1a3fc79926eb45aff70e3195b4f73328e632554fc6bd9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=igcse+business+studies+worksheets PDF link annotation
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/260ab860dedcb68f10d97ac743b7bef8/79827178610.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16250788911374809278.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/garux.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/6412027726.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/zejinugizutojif.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/65224297051.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96b8eafa0---jofijurudozepe.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/408040453.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac096f25dfd---lewefozevezoxej.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/mimamaxibonej.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e836a520d3---43365162668.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/32975364951.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173746a5c4---64558527929.pdfIn PDF document text
    • https://granitnet.hu/editor_up/wapum.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/599981edbacf8d547284a5fed5a4e086/14116315294.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806ad7d0a8e---ganufokomik.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a12e65f9efcf35a0e4da36072cce604/18412217690.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2dd9c68789---93389035701.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210520164754.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608133faf05b2---xikosa.pdfIn PDF document text
    • https://airbays.com/userfiles/file/72622616461.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607958984debd---kosalewakevawoloseletu.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/67955669449.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/97009869463.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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 10812 bytes
SHA-256: 1d32f603081a645504c4d98b2accd1ef2ed484126628ba3b2ba8c550db846dfd
font_02_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 17952 bytes
SHA-256: 738a27ed93155afa4d133923f4087a632b040c3c9785034185e7da9def0397c7

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