Malicious PDF — malware analysis report

Static analysis result for SHA-256 218c92ba9f906ea7…

MALICIOUS

PDF

115.2 KB Created: 2021-09-21 06:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: be6f907a70d960fad360e95dc0e469db SHA-1: 9df9afa8e765adb9058593f0dda5d00343c7420c SHA-256: 218c92ba9f906ea7e389d748b5ce03df09c79b1059a30f8446211c6097ef7a79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, functioning as a link farm. Several of these links point to compromised WordPress upload directories, indicating a potential distribution mechanism for malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely aiming to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3634

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://kimcert.com/E/file/nulinuvu.pdf In PDF document text
    • http://gldbirdgel.com/user_img/files/wasaxijijawufunudak.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/45951792015.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/3179105004.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/lanofixadagik.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/kezokowoli.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/fabojididujoramutatale.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/54461880149.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/52846659049.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/2213563431.pdfIn PDF document text
    • https://tigaintan.com/contents/files/jemigis.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/puzumaxaxemoruru.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/kesanuserifapow.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/wewewifi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145f5ec7a378---wizalonogaziv.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2dedb6da6---bujejesawunoxamodu.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/ruzeramafulirikuxegivowul.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbda0200c---62139543249.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/30285721949.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/kigulegagijaxunenetoga.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/boniluzevepegibukoledade.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/fokovabebobitakitiz.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613433d0647fb---muwisewusewabalupufamiwez.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/17218286837.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/54734163513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+black+and+white+drasticPDF 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_off00015b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B70 10952 bytes
SHA-256: 3c91f6430313698702cc21619fff950c4c73172cb2fa8fa2c7947cba89217738
font_01_sfnt_off000174b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B1 23656 bytes
SHA-256: 78ef27fb6b5724aaedff172bf12f23bd6fbdae1eeb2795a5a11dfb3632750f8c
font_02_sfnt_off0001b23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1