Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b130d04e9a2740…

MALICIOUS

PDF

94.2 KB Created: 2021-07-17 09:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6de80bf644a00e362ba60fbeac840853 SHA-1: 38e0f258290be4041b2705aa7480da403ce37eb9 SHA-256: b9b130d04e9a27409d74238b00857e8d6ff5d7933ef06e687e4b528f9f1f7505
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external files, many hosted on domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://latework.cz/soubory/jekupatarux.pdf In PDF document text
    • http://amghanoi.com/images/ckeditor/files/gupokotijamivito.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/xijivovige.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/9296821652.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/39764539278.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c41eabaaa---kojimidugeg.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1332f3b2d---14969680993.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/vafaweromupurupaw.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160886eb78de41---21928559223.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16070d55fef806---75038535259.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/96413609659.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/fupupajurer.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/29b0da25bec89a4b34893521785aea96/nuriratutowopegarow.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/co06un3pbueg6f43qm1daejodi/newujafemutabo.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/91320181673.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/68860302847.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875aeb20dda---zugonepesapodozifuleliw.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7454ae055acbc63fbfb1f9a85485bbfd/58314250220.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b9512069d679136ae9cca42ba1b65a54/wixunezifaxup.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e9a1761f---vefubupalokiziraxavudusaf.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ffca16fd---mipudabenekaxozinerejexa.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8c85365ae---nibarutudagugokiz.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/tipatigibajuremugelet.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/66098017847.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd72e56e4d1---87909570052.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4199b3aca9---95869001266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cornerstones+of+financial+accounting+4th+edition+answersPDF 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_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 11052 bytes
SHA-256: d6fb7c91e298819f3f2851c24d20bf2d3e270bb754eeb66c78aea03530457aa9
font_01_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 17052 bytes
SHA-256: f82234075badd7f55f21e2eac4d91ca7a2217723ae998864e96b0ad79655ddd2
font_02_sfnt_off000152c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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