Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61f226317abbb96…

MALICIOUS

PDF

86.9 KB Created: 2021-07-24 12:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3ede5598d974b21549ea8c78640c873 SHA-1: 2d57a7575934046590aa14cc5d597aeef000c630 SHA-256: f61f226317abbb96f19720716bb0522ebec4daf1a8b26350e0e2f423af711fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coonvalleycc.com/userfiles/file/guguminanow.pdf In PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/49295532394.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fc2b5ed49---lesokebedezaz.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/fubeburugeru.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/mobusunefapomejelalas.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96227fcda---92627367174.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/27459085626.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/mokoboninukuvite.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/25805054771.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/s21nh95q5jqgmhdrul8paqofoe/6216659763.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/8119322801.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4c85c0cae5b21db0673663433947f2f9/45299476165.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c70be4d37d6---nopuwebitanujijikuvimosos.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210515074705533964hvnv5a.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731debbfb12---mogimozukutadew.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e4efaac455c---70721728851.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210703105901.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5hmuvhsjq9rhkme70ae157u0gh/jebujezojuxekud.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/ziwisel.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/95789990389.pdfIn PDF document text
    • https://ancoraeducacion.com/images/21098920340.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/kizivujukupezavabiseg.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/lamarinelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=naruto+shippuden+ultimate+ninja+impact+download+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 11176 bytes
SHA-256: 6317f7481ea22ca332b291264bd2a17c828beaf0e743d36b58b86af16b1d6d8f
font_01_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 16844 bytes
SHA-256: 747a4bea90324c90f4b264f8291925590d5886b94e770d35f23ba15879a909f3
font_02_sfnt_off00012747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 3168 bytes
SHA-256: e9ccfe149e39267a1931ce108c58f02d49fa236c8c58529f5b38250e885e8215

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