Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc7d39c9ab10e2c…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 09:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4c91d0637453f4ece3a00b68a8d4e6f SHA-1: 5896df0d3e3561fa058d0e92bdcfc38f7c2b92f0 SHA-256: 8dc7d39c9ab10e2cb421317d3e29a62c7d75728d5b73272ee402cbfe2decc65a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to various domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=most+beautiful+games+on+android PDF link annotation
    • http://betonkeritesek.eu/Content/files/6234177138.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/fupexobibi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab0ecd2f4d---32353703177.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/vetavulederisukonezitel.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/xevularosomuminusudop.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a83d6bda---4566243160.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/36550217029.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210924100216_1321166052.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef4e44a570---belepavikopifiwul.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/jemifalusobuwutug.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/zetukevurisinuvesizase.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109161949405603.pdfIn PDF document text
    • http://93564497.com/userfiles/zeregawo.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/52605950123.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/xepil.pdfIn PDF document text
    • https://renetravel.ro/images/files/69557875820.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/016748ffaff0ac104543d3591f474ef0/36776704164.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/24010677130.pdfIn PDF document text
    • http://sswjeans.com/files/luravale.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/72674408384.pdfIn PDF document text
    • http://balone.net/_upload/file///74273671876.pdfIn PDF document text
    • http://vning.net/filespath/files/20210925174601.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7g97o349ml81sgf5b4b6uo5ri6/lopifiso.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/19151759265.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_off0000af08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF08 10932 bytes
SHA-256: 7375bbb2667656cde6653b8e1d17bcf84e391dbf4f5017ad3770a19101783da0
font_01_sfnt_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 15412 bytes
SHA-256: 97914e19b809ee5ed5b5760ff0e98cc98ef06be07d1bdd88b37240228e213087

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