Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11d7c35cccd6318…

MALICIOUS

PDF

93.4 KB Created: 2021-07-03 03:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 40ed0bd9b6160a76490e31c975e75650 SHA-1: 806a510082581fa84e4e97cdabcd9c8e31ffa630 SHA-256: c11d7c35cccd63187ee5cfa42b9c2872fca6097044b5b43ef9dc803b8fbed1b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kodcomputers.ro/2664/uploads/sapelafutapawu.pdf In PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/en006ah8d5smdcpmc0df244ht0/73408517642.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/49f48b9e38591b43e9d519c6bef26038/bexogatifaw.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/92b99b7a9db29cd4fd1e5ce47ac1a4ba/toxugimepet.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790a2862b8---59207651228.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/2498620504.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/73565327771.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160793e9739588---84415990427.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/lubefitusumutadu.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/12267572425.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j55q0gpdbtac2kbcjl0i1ca4ep/kenanane.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/1017459721.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/vodatupaner.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4c68cf5cfc1d10822ec891451a2d6068/bumigetukiwuwato.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/5290451492.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/99h4hq6kj6mbs9j26q4jh33n2o/dajekerifajidexigetimafi.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075629b486f6---kesufiworatozav.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/jiwes.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/tepovovimixurozonugi.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/jaluletotagox.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/67901584594.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f9d7bd03---8329850377.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/83018710d3869e3e22e892b087f53075/zezifesoxujewilij.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/49027b4aae3a69057e349dd2c8aecbf0/69951323498.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10f789f5f---laguwemetoviboxebaxon.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1c023cc27---fasazadolefaloresanofakox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+ios+hack+and+slashPDF 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_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 10512 bytes
SHA-256: e1d95ed69f91641a9826bac4bd46483cd3f6b88b28e41a4b68cb07a93398cedc
font_01_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BC 17148 bytes
SHA-256: 8c642c8dd5030ae1661399345af5b20b70c91747710ab1a6ee85e5a4f416e98f