Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da364da43c90d6c…

MALICIOUS

PDF

93.6 KB Created: 2021-07-14 00:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e63d0648c2b8f0fcf145155e54a4c78e SHA-1: 5f5ee9caeefeeab5de348c0162719d13d5bafdbf SHA-256: 6da364da43c90d6c3b3dcb184cdf4dfb6fd0103abda69520ef41e5547351f87a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=preposition+sentences+with+pictures PDF link annotation
    • http://cedule-plachty.cz/files/file/buxado.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/saliro.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/59390996865.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210605/file/16228257177103.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/23710938109.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/rilitobapugimij.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/82310046615.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/11563431370.pdfIn PDF document text
    • http://primaneighbors.com/userimages/55564752029.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073df6ab9e82---madezabokuvimululu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725be3c6c7d---347599665.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b76bb221---53499184253.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/81606090223.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/gilemawudu.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/ruteki.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/meguvajinowore.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mpddcu1vt29onms6gpfb6cdr93/51899768968.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/vejowuvaralonefilo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3ada6fba---fagusatotol.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096a94859245---58491912722.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/32936849714.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/libenukituz.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tojiguloba.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_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 16840 bytes
SHA-256: 42ed0badce279ee268e20315fac3cfd6ba744ddcbf74a14e2cdf381cad949177
font_01_sfnt_off000139ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139ED 10448 bytes
SHA-256: 5eeb896565f72ffe1cf5cb6b41719cde87f1c8961c8fd12b71225e06eb1bbdfa
font_02_sfnt_off000151ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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