Malicious PDF — malware analysis report

Static analysis result for SHA-256 72db555ce3aaffa7…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 15:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8fd0e4e6ad8fe7ad60869ccb79e43e85 SHA-1: 63d5d3d0a1912f6a48e1e411802b19e40cf9e3e7 SHA-256: 72db555ce3aaffa7b00fe9b74e243f7602bb03725806b0ad9b745575eb2bb20f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • 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://innersolutions-uk.com/file/49160394002.pdf In PDF document text
    • http://myblindz.com/fck_user_files/file/59960897324.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/35339502824.pdfIn PDF document text
    • https://tekartltd.com/upload/files/nogezigoloxuba.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/wefozinawusidubusokaditem.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ab70f3041fa46d87da8705f886b1663d/81577071368.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/rifaluguwijuwa.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/fitibifevidomulan.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/sixola.pdfIn PDF document text
    • http://only-svet.ru/upload/files/9415687570.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dfbe3f9c1---96063232016.pdfIn PDF document text
    • https://buka.ru/sadm_files/8077345872.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/63806052105.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/bibizasek.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/70372769410.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/mimijiwelinajuwogu.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/64978541670.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/sekelitakexoren.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/vuwunadepi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613384524fa46---xafonunivapuredonomop.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/161821237952.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/kexudusebudizapowotukosej.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/75426299111.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/46314447694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=english+subtitles+downloadPDF link annotation
    • 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_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 10736 bytes
SHA-256: 59377515891a12126d6904ac378e982a931d4742b936dd6df9af07542d87305b
font_01_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 16452 bytes
SHA-256: 48d62d1574608c906f95b0c3116d71df59c8bf16ae0cf93ab7b19fef30bd72ce

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