Malicious PDF — malware analysis report

Static analysis result for SHA-256 505e3c129a11de37…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 06:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8eabbbcaa9b4eeea3d8297f3a77b3c33 SHA-1: 5841b46ff73c47d5f7c38be6bbf7425f08259c44 SHA-256: 505e3c129a11de3767d7d6c6791238263d89bcf448491c13a38483fd3e37323a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Tampering

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The presence of a 'Security software disable instruction' heuristic indicates an attempt to bypass defenses. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs, many pointing to compromised CMS uploads, suggest it's designed to lure the user into disabling security and potentially downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d919c7d1---zomegaw.pdf In PDF document text
    • https://alteanetworks.fr/img/file/lexodonep.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3972d28af7---14435371746.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d5626f178---59458201364.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/31361184952.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210731013412.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/satuwanogejigosasusa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/weganezepaf.pdfIn PDF document text
    • https://motoralbini.it/files/file/93891487977.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/25b48f25687116ad364839ee26214742/dubifujuvavasirunow.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/rtainbq8ooclkd60p8m4bnqb9k/tuwutawagijej.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/fabomamorijep.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/mubiluboxijikimef.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffaa482950---zaroromolu.pdfIn PDF document text
    • http://bdaudit.ro/userfiles/file/18268952344.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/mezumujujajujosazolo.pdfIn PDF document text
    • http://yilip.net/userData/board/file/kemiloxanodedow.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/63227360860.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c6c77525---bozemaxafove.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab0250b500---momerusisizitek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=conditionals+grammar+exercises+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_off0000c7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 11096 bytes
SHA-256: 890551f113dbedc5c50a3c40b9576a7b1ffa29bad62575a2f1ae6057ededd267
font_01_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 18052 bytes
SHA-256: 19e225ae7556ad216ca96f613bbc10fac3c24822348b2b4019d80d7e41916eca
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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