Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b79fa8d09e4e20…

MALICIOUS

PDF

87.1 KB Created: 2021-07-28 09:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00a45c06b12c8596b247e740805d4e6f SHA-1: a543bac2c64a99cc4aaf677b520bfc661afe39f4 SHA-256: c6b79fa8d09e4e20fecda2a793213b85bf87eb26eaa455ab48f559b9ab80c491
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter related to a 'play script pdf free download' indicates a lure to entice users to click on potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://amidoux-peintures.com/ckfinder/userfiles/files/lobotow.pdf In PDF document text
    • https://aimtronu.org/userfiles/file/39820961797.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d9915bd4eb1---80724846394.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/712402c079d57ca52072061620c84b89/78506020816.pdfIn PDF document text
    • http://thuaphatlaihoanghuy.com/uploads/files/faparatafudizaxojofufela.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/220ab82fd5fdf76a014bd46c3407e917/wadevubupudavukimaz.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/dusenarubutuzevibikozome.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/didubopupozibujis.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/nedemobarutuf.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/71804664928.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf35ab22496---piwepotuxaxebegox.pdfIn PDF document text
    • http://zgic.ru/!upload/files/tamekanafavujumepir.pdfIn PDF document text
    • https://olterus.net/contents//files/kizaf.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849294e0bb9---zuzojebiwawibopowusuwuwa.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/91847030293.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39d9ce1c02---mibemogekulu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/57122a9022392fad5c56dc1e1dd0a1e9/ramitezumipisimufavoz.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8c2912da---38525481115.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/59873866178.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8e8542c45a666fe8c6d8beb370de556d/nisuzakevi.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/ziwizotenuv.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e211f3e7b---mizadiruzusuwi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bcaacf4---sazazasalen.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772c4c84ded---josodujeziwunufojediz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=charlie+and+the+chocolate+factory+play+script+pdf+free+downloadPDF 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_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10948 bytes
SHA-256: 7873f7d407bf6d79a58130ebf0c8eaeb563cac6c02eb5fc0c6377860a4444153
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 16684 bytes
SHA-256: 1d3e9e2327369e3b97a76bc0385801d67bb386931fdead79b2a64315e33141c4
font_02_sfnt_off00013445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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