Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dd54bb576ed536…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 03:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e227b59a02a98a7df0724761fbe10963 SHA-1: 0174d7ce44f5ac4055575e19c0873966a7264acd SHA-256: 36dd54bb576ed53669d55abbeb461f4003fa6a94d8af1749f85216008d571ecf
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a tactic to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://biotledlight.com/userfiles/file///78757618022.pdf In PDF document text
    • http://akgwealthplanner.com/crm/files/9103963988.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5e1dfaca---tejenijetolorod.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ktqk89v76vns2vcf3l8434r5q0/dakudenikuvoxutupibikul.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5d21d062a---57328716252.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6ffe757db3d9294508b86d85d73b092/jakimaxunaxovokurezima.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/bevavosuvunorugexokaw.pdfIn PDF document text
    • https://cmoretv.com/userfiles/digatabizulotofoxidumab.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/68880292521.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/dbfebee3afce87fd3323544c5387eb1f/96102850564.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wosuvumakemifozudagimifuj.pdfIn PDF document text
    • http://chinazzjx.com/d/files/90059700466.pdfIn PDF document text
    • http://asustainable.com/global/file/tisodelazarelesatame.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/63275996897.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/g9rgk8mdifg2c6tfah8oq6a4kj/43991275197.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gkeklp9v4do2o01nrd4va61i08/wajumonegabuxogipu.pdfIn PDF document text
    • https://hoongnau.com/upload/files/jotuguwefekevinupulawe.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/1kigca88rlfjucb01tg6gkvsm1/lafewujum.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/39e4dbdb005dbd5296da46129f1ce741/kodepifawogom.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/92157059690.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e1912a66fcb413b7740fe377f87b5c70/13676710768.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/bosezijowif.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1339b8958bc52cab33398a2cdd478aac/77636463931.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/47421793881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=financial+accounting+test+questions+and+answers+pdfPDF 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_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 11104 bytes
SHA-256: ae7856d0f7be4abac012f9649cce3a9154f0deac003d33828695f9d615941fb2
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 19572 bytes
SHA-256: 290af7c8d552bd0d2a2ed45672980f0652745606b307c7798c94a2c3dfa30af9
font_02_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1