Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc80d27a6acd48d3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 21:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7497a9c3558cc2e8ac490a88bfb6ac2f SHA-1: 73f433eedc2268d10328db18d3a530a169e1158b SHA-256: cc80d27a6acd48d34564efd806fc3db5eddd0d10addb8f168bbcf2971ca205b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structures and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://isvpro.com/custom/files/vozivekuxijizaw.pdf In PDF document text
    • https://rimi.sk/userfiles/file/868155798.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/pidufa.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613151ab003d7---95095232971.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/tajawokedizanapenupeb.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/97239689370.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/43185665386.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/danobepapew.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/9572232925.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/foreleza.pdfIn PDF document text
    • http://donghotam.com/luutru/files/88317282362.pdfIn PDF document text
    • https://trexanh.net/upload/files/56639755795.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/vuwojaxagu.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/88079494220.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/74300033868.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/16813634864.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5290859af---49484925516.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/67589115049.pdfIn PDF document text
    • https://wonkingchina.com/d/files/16003548160.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/3771153738.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/pilafulebisovosotig.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/eletrarbp3tuhbkurledmltpqr/dokonapivarawisitaxupevu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/xavaxufonebibizuxomawaju.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/siwenobepumurowavenulaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=locate+my+phone+app+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 10740 bytes
SHA-256: cbde036d3f4b152f5786e8a8916e8d0b47375a4c3fe082dcc7d411c9935c1006
font_02_sfnt_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 18432 bytes
SHA-256: 595a9e01102a87092dd5943c0d32fffe6b6d6a54724e9799e7fbc9d9efa58d8a

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