Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a4b2675656a462…

MALICIOUS

PDF

133.3 KB Created: 2021-06-30 12:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ca9f7ba37e98c9173303e38c679db8b SHA-1: bbd9709575f77cc4086b8371497b1f49fada60c4 SHA-256: 41a4b2675656a462b971ba38e45a5219f0bf04c856d0dfd317e4d1210b287cff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a password-protected archive lure. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to host malicious content. While no scripts were directly extracted, the PDF structure and associated heuristics indicate a phishing or malware delivery attempt, likely involving a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ea9a9a67dbb86a7015eab4a5146434d9/fetuvedupomumexomapanabon.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0b53b070---94881974584.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fk2ku4di4o8prvembk3dnebar4/39803418189.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8c3608a0f---16224215196.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/0ddec44cff7f29973ad622bb564bc573/55922812131.pdf
    • https://emauto.lv/index/images/up/file/gazekuvex.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c39ccfb3dca---78987429334.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983a60befd---48454506628.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/d6jip8ga0p61f2eoe19upnt7ad/4986151967.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db4f01f92---xijap.pdf
    • https://infoenergie-loire.org/userfiles/file/darejoki.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/59upd2u9jtarni4ndlg5apvdu1/tapoxivigexoramapexar.pdf
    • http://goraku-sangyo.com/userfiles/file/tisepowadadaj.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b317b8e9d1.pdf
    • http://akcjonariusz.com/UserFiles/file/70282306823.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6f83d98fe8e39b3843fa201d8dd10ca0/monewuputibepenedetanumes.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d6acb041---28099232495.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900c78bf66d---bavotunuto.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/79312534736.pdf
    • https://caribemed.com/userfiles/file/xijeposoxobedasekuribapa.pdf
    • https://beautyyaurient.com/editor_upload/file/xupetarazovusipus.pdf
    • http://asupuro.com/user_data/image//file/87506712378.pdf
    • http://sireny.net/share/files/rovobega.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9a7f63fe3c7514f25b8ab14c9abcc452/12414154448.pdf
    • http://charivne.info/images/file/filituvosajovuruwatawur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fundamentals+of+data+structures+in+c%2B%2B+by+horowitz+sahni+and+mehta+pdf+download
    • 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_off00019d1e.bin
4821c96ace2980351378e38f4bb30c2b7de3a7afe9604196dd7d6b48b7ed0d97
pdf-font-stream PDF embedded font (sfnt) at offset 0x19D1E 11360 bytes
font_01_sfnt_off0001b790.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B790 16792 bytes
font_02_sfnt_off0001cfa2.bin
c64c35b94e8059c15527bd9072ca7726e8578b6328dc31418176505889706684
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFA2 21940 bytes