Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b45b23be220929…

MALICIOUS

PDF

101.4 KB Created: 2021-07-07 18:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 22c2efc5b54f094569469960d5f7e375 SHA-1: 4f3f6091d432c6884df193c2c6eb442752f004bb SHA-256: f1b45b23be2209290e044dfb1c5161271d6338faa88895a201b7a2972cf3fb0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using disposable hosting for these links. The primary goal appears to be directing users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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
  • 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.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21f167fe4---nubone.pdf In PDF document text
    • https://lesfeesdelhetre.fr/upload/files/jupid.pdfIn PDF document text
    • https://ghnservizi.com/file/75665333402.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/dewepiwotofofakipufovo.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/kesaritafod.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba6d8303b---femogikonobikutamodonixe.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a2c814cb27b983993ed8569c402e641b/musizesisewavi.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/44958085024.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a366df8b80b---54415225338.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60e6ed2fb---76102675064.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2abfeb6f5---gapaguwopidosob.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3001bf5c25438dd41251ecddbc77c1f3/tajene.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/zulizunofemiroxufujal.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/35808444711.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609293edee443---vatomudafikavoka.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/85805040662.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608739293c452---fenojusedogepajijerefumup.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a48bc2cea---69922983324.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/12449088684.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/zakawarigitusekin.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/863b2b7268b33f5babe4bff7c501aac7/lufufeligipota.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/10544833870.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pu4hrs3gjueah4sr3a7p7ge437/lewema.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/pejuromolusano.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210625_053502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=facts+about+dinosaursPDF 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_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 16952 bytes
SHA-256: 489bb9f6a9c31ea8bac9ff28b9233564618a717bd0ea909ebb39b8e731c6e5c2
font_01_sfnt_off0001587a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587A 10404 bytes
SHA-256: 15b98b88a3d868dec88a01cc72e253451695f9cc5a2540102f3374e8ada9ccf9
font_02_sfnt_off00017021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1