Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3319319a3ebc31…

MALICIOUS

PDF

89.3 KB Created: 2021-09-23 02:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f2c1c0675d41197c3a5e5e6ac8257621 SHA-1: 25b240b6471f2f063b03732a9aa75cd80f17f4e6 SHA-256: 5e3319319a3ebc31e9f16320b6c60a9353961d1c66564d8616d7d46721af67ad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which host other PDF files, suggesting a link farm designed to obscure the true malicious destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6634

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135668434189---75519171755.pdf In PDF document text
    • http://abwingsjanaf.com/uploads/files/valalugujumodi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130749757056---dutumuda.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/xiluwubejojevixor.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/zibosakasitemejapijage.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/49935543747.pdfIn PDF document text
    • http://mp-journal.com/media/file/wuxodowililetax.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210917/file/16319022146767.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/24927931022.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/27529000407.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/nalewogixo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nixifurabafosanotabutoke.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/65712964105.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/wabuludimenu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614993e16e13a---32732453358.pdfIn PDF document text
    • http://www.puhito.hu/uploads/tapoxaxig.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/40515352362.pdfIn PDF document text
    • http://th-hl.com///upload/files/pewigumeze.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/takojeb.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/jovisuvo.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/1907999147.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/pevomudirekekelut.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/palorisova.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/suniditoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=aplicacion+para+grabar+audio+androidPDF link annotation
    • 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_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 19712 bytes
SHA-256: 15bba03a0202ae067c1bd5bfb9267f6b7b5c385598a55cf9bf3fa9d52c3b438c
font_01_sfnt_off00012ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 10512 bytes
SHA-256: 84fa802a6abdfbc5248644763ebfd09a130b2e529a29e1a28d33fc85aae7a9d0
font_02_sfnt_off0001477e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1