Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29b95401bc123e0…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 19:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3e67e54edd8112db6970cb77904c4e8 SHA-1: 2bef92c25dca432802af89ce4b9381e6917ab145 SHA-256: a29b95401bc123e03507ffc67affcfe093fd9afd835d59cf5f3a388b43df219d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=how+to+draw+anime+cat+girl
    • http://mdsalon.ru/img/lib/file/60966474340.pdf
    • http://anvlaw.com/userfiles/file/18343949023.pdf
    • http://greece-ex.com/images/blog//file/dagaxekarij.pdf
    • https://musikkursus.dk/userfiles/file/77005113369.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098551624390---90321964097.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e1460dade---vupinezukevaxuz.pdf
    • http://cestovni-postylka.eu/userfiles/file/43005351375.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sutuwoxitewewukowawe.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c493f8a1e8b---15764034813.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/lln8ldcbakdfeu3ae9tm47t234/samojaf.pdf
    • https://daquin-ferriere.fr/userfiles/file/85973330660.pdf
    • http://land89.com/ckupload/files/65293123196.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3921352e233a783db10d8e8d2e6b9c3e/63137351977.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2731f5a5fa---90755098056.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608171272b01e---36422778134.pdf
    • http://aaaexpressac.com/userfiles/file/69043406561.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/l0rmt4j94i76a2gv88ssfao5pp/fawujipiralotilezorit.pdf
    • http://alimentosldm.com/userfiles/file/sarelolakiwojoxenib.pdf
    • https://ascinfratech.com/clientprojects/trading/file/balilad.pdf
    • https://dadesigning.com/daduserfiles/files/1279852788.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b1f0dc7c3---1571492292.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/cede3a1ca5b1147ddd463de37a2532d8/xebasegogimobewogali.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b66656b2---xuwapilop.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607692b2a400f---71230695649.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95d9bba40---jisafi.pdf
    • https://betenagro.com/sites/default/files/file/buwilorumafuzobu.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea9f32cdd---40686817091.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49f.bin
d47d9cf2c5892f60d00cad186e31dd8292cd4cd36661ac753db3b3158bab1b54
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 10624 bytes
font_01_sfnt_off00010caa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 16792 bytes
font_02_sfnt_off000124bc.bin
08fd91a4dd5c41641f128687d29ecfd03760e56d4c8072b5372640dcc18602cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 17192 bytes