Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc1cdd635a648d7…

MALICIOUS

PDF

101.1 KB Created: 2021-09-11 23:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5556ca3111e7bdd8a2dca4fbfb2791cf SHA-1: d2eaeef58a7cb4c8f026e2ca1f49ec13de6c9312 SHA-256: bfc1cdd635a648d7b9f1e8993030630988b9ee075c26568353a0d3331bdf82b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://chcial.ru/uplcv?utm_term=pokemon+emerald+egg+cheat PDF link annotation
    • http://ettermanenterprises.com/ckfinder/userfiles/files/lipilujuwodutagog.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/13541488630.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/xikomojovuwajuzigaj.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9cb9da5d2c76acad829c41a3173526f5/xiruke.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/46906690675.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/mesuba.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/xegapurenadigebanusesixe.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/pibuximodagiwogurulalimuf.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/jevamigobodafupigese.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wuzeladujapinal.pdfIn PDF document text
    • http://szhlfz.net/upload/7197035631.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/97458708952.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42c0db39a---giginalofozo.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/zubebavepugadikun.pdfIn PDF document text
    • https://noventa.cz/media/files/file/15437958309.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569036c06c---32347370240.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/55348719976.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d5c053a9---78231736094.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/jobuzu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef5f7f684---kugenamabujepelojatop.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/xujovazepopox.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/59774231324.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/84862935698.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/guxasexajabitopeme.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41318286009.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138058900182---72567766664.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_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 10652 bytes
SHA-256: 1febc879c698a1855e03458fd58fbefd041717c6ee9dda702b10cd9c23082d7d
font_01_sfnt_off00013d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15551 18548 bytes
SHA-256: 161d9a062c2b4e880f484b3184b1ae067e9b5fd01d41416b97f01b545d571e00

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