Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba6211acf369f2f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 06:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8ee826abbb391f461ccdb4b0423b5ac SHA-1: 23d99739adb49c52b883a127facd966a94340a42 SHA-256: aba6211acf369f2f5d73f4cab00582f8f37ebaab22993f2ff2f8e10bb13e2091
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting an attempt to host malicious content. The presence of a visual download button further supports a phishing or malware delivery lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=i+want+to+download+dream+league PDF link annotation
    • https://skiclubraonbaccarat.fr/pdf/takuvakeziwukoxagidit.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe22bf5f2---22140250138.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/liwisuvekinunudider.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/50832218131.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/vorujadanek.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/71071471565.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/wulasisidemabowubineraxu.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/81406782628.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/23493310191.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/33768744587.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/bojugerub.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/98857035887.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/14199760700.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/2a5d85f7ab0e0fd32581422089768260/40312834122.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/88f1c9e27ab33e16e13b1f8875711104/88680834545.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vixepozop.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/46438871583.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/rojogiminapobanuro.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/jewuzemozojefeledubomujow.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///58803105658.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210906063248.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_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 10468 bytes
SHA-256: 3e063f18638a28ff5842a06a77aa12692074b72f551cede0cd22101a0938f3a2
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 17740 bytes
SHA-256: 42cc508cf5904bf738231a88ec207adaad73470bf04356a6890bd197dc796c64
font_02_sfnt_off00012f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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