Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44507b5b7533aab…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 02:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b49234f24b5655bdbe72247f4a8c5036 SHA-1: 69b71d07840c0bae64536bc1781fa9e7bdf4f5d7 SHA-256: e44507b5b7533aab2caa965e3280f5e0235ac64517a01bc2b9beb801936fff34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which host further PDF files, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to trick users into downloading further malware. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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://questyme.com/userfiles/file/98868223613.pdf In PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/batatiwotesug.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/db75f53cc4d6547c1186609ada38f3f9/nunejokaxajewetizipugi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6792bbcf---67356635819.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/14206766163.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db7087efcc---tujutimubijofamuwofibare.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/35070269922.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/37388621203.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0601184121eb309c7f4c4800ad3a5b64/91179961474.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/55262557515.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/13039062887.pdfIn PDF document text
    • https://motoralbini.it/files/file/nawenolusikokugaw.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/jaxixufaromo.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/10918017404.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0b215af81832925a4862c79ca211a8c0/mibonejekurasetimo.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/15618029027.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/zabobi.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/63938171818.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/94076820477.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/27225289823.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/84648542406.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/25635910841.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/pekinovujotabafupefovobow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gta+ultimate+trainer+download+for+androidPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/lewixiwuda.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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 18404 bytes
SHA-256: b6b433ec7ea52ae6fcea1a97d44cb724d2d2293bdd05fd9efc0da6ac9f3f7da4
font_01_sfnt_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 10572 bytes
SHA-256: de331125f416430e9b3ede5c19ad8ae0c6915427077652469748b82b1cbdeeac