Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cdb3bcf3f2e578…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 10:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c07b313bdc9432a36fb489e3375b39b SHA-1: f739b9d349d2f71948a1d39e3b0fb6e87a2b66d9 SHA-256: 27cdb3bcf3f2e578e575ebf8311e00787882144c663f05e8a38f822233d08469
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it's a password-protected archive lure. This technique is often used to conceal malicious payloads from automated scanning. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to download a secondary, password-protected file, aligning with a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://usmleworkout.com/files/file/72705046693.pdf In PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/vamininiz.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/sopuvemiposanowaku.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e7a43f15---lavegomeboteno.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/14b7b8c910cc1491ea1607127baec184/gazutisenigibe.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/gevatedowozabatogu.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/64638201735.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/801c0bc7cc490c9db5fccae8ef6d2c53/todugonizodemopizuguzubo.pdfIn PDF document text
    • https://artbynela.com/uploads/file/lokamujufovusoxa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wiwakowodewinararepuzixek.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/f122261acabd3b9136deb3ff1149f6e7/dawetakazazudig.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/jajuperamuzenuwen.pdfIn PDF document text
    • https://medpressa.ru/files/file/59714973573.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a78159f0e033321ca4c6506cf2c45594/maxudafimexovozotosod.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/68872183480.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160750b15daf20---76805901301.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/28767370866.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/medekulafawivatitevuduwu.pdfIn PDF document text
    • http://oris-am.com/editor_up/56029602339.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ac90755092fdccff2cfe291c5e45e0f5/93315477234.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/92027480416.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/81430521244.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/28083881054.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/75216665492.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea86666027---13382149843.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080274264e85---24284659005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=indigenous+peoples+history+of+the+united+states+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_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 18580 bytes
SHA-256: a90ab71ce89c7c9eab1b6dd81fdc665e66ad11370f5b09b1c3c015d475d03fb6
font_02_sfnt_off0001337a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337A 10940 bytes
SHA-256: 3d3cb860c2c38b0d3c339ac49a0d967658d2aed7ea6a89ba9597535f3c9d0d51

Open this report in the interactive analyzer, or submit your own file for analysis.