Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e98ac7a1c9dfe6…

MALICIOUS

PDF

875.6 KB Created: 2021-07-02 12:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9313c605f1f4d9f86018ecd24fdd3f92 SHA-1: 5ad011d468e97ceb6c6ab1ff6e47f8953261ba21 SHA-256: 35e98ac7a1c9dfe68264a5aad57743b9b10dd2314d60ba961adf9d6b61a2fc23
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains an urgency lure, prompting the user to click a link. This link redirects to a phishing page hosted on a compromised WordPress site, likely to steal credentials. The ClamAV detection further confirms its malicious nature. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4740

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://irlanc.ru/uplcv?utm_term=blood+stain+on+pillow+case PDF link annotation
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70021457db---6258066097.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b269168036---rubukagafipike.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/jnlnaeakstdc889ivhmlmq7hq6/bivogosevidunavireroliwin.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd7c4754f---fumaxetunemuvulaxepira.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6249456c6---gapobavipitodo.pdfIn PDF document text
    • http://erex.hu/upload/file/87663430519.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8cf420eaa16de92ec0ed866e853fb60b/34027588476.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/819b9d98b5e7d4ba8d2ff966882c537c/68181070184.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/84534717592.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8249ed07f0e90fc3472f2d1161b69ab7/bofokofapu.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/17994328088.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5fd12a41d---pajunoveguxesepalurer.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/28137956883.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9c7059d3---83130007736.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c751affb426e3d1ae84816fa153328eb/9314861932.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2b304d508b49b042586db778acc58f47/lobomidivetozuvidum.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c498efa8b03---93176876889.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/12475843749.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/gamikuvemekabusen.pdfIn PDF document text
    • https://immobilgold.com/file/8234658333.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/30226089228.pdfIn PDF document text
    • http://ecole.ru/text/images/file/74033799966.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/3359e11a3cdfa904d3c9429ac17cbba1/74091546183.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_off000d3799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3799 20536 bytes
SHA-256: 3c1f4ca3def7c591ef9501a741619d8c06047670bde85523202151f52147a25d
font_01_sfnt_off000d6beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000d840e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840E 10544 bytes
SHA-256: 9b3f5cdf1e137746c2e94fc3b75139c61ef12c7a945d33f96e53b0a7b8db25c1