Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cfbfc86e01455e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 03:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5187450e6ad83c29e8b49f70ac829bc2 SHA-1: dc6fa1d36e59822cd9fce827d2a583de487eb98f SHA-256: 52cfbfc86e01455ef2756c8215492c9c305bda0b011c39e6bd2fdd23cca5abbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ubp7o2dlhkkuiqu8biic9bdent/rawakuvomogusigudomuj.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092d82c2784c---29036192644.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/93314224002.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/aa6f6d7897966f85d263234d3ec65651/57173541256.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/16338589470.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/27032230437.pdfIn PDF document text
    • https://temahr.hr/files/wogowa.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/af9603f7341458c8e05112fceb31483b/nosipukaribe.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/zusikabexo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c3cc93fb02cd8ae0d9cbec0c08e9f78f/96781268093.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b43e322801---78301742580.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210813123347.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/gamogulo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ef9a6c58174d948fc3b7a8e9672404ce/64630083011.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/3410386309.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210804_DDDFD4AE89C1C9ED.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4f8eb9bce7e745b9c3d7f5aad87913a9/mosexolekuratoxax.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/428db5e56aa3db477b870d9367b507c3/gotatazunezaforelodoki.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0dfd4b47cace8cb6ca885019d9043fed/78955103209.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/70ad6abb11f7c85852ba784de87ebee7/47913589948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chery+qq+specificationsPDF 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_off0000b6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EE 17064 bytes
SHA-256: 476c932e510d079a9f439c35859091358b5a8e29a318959eb3fdb0e19f749907
font_01_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 10820 bytes
SHA-256: 51a975e971e385e13ad3bef90d1271fd5d75a811d9e7c8e2e0fbf4fd8a050c32

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