Malicious PDF — malware analysis report

Static analysis result for SHA-256 235b6754085ea1ab…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 20:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 69bf4982829f78b3fd55fc17fe4cf321 SHA-1: 747e56b029e200b58cd38768a5de7f8c3092cdb4 SHA-256: 235b6754085ea1ab66697f6f5f4d37fc5d3e8721116ce447f8a397e8f5f1cfbb
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 a machine learning model with high confidence. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eaf9d4487---gisefetexakokupodaganuj.pdf In PDF document text
    • http://mygiftltd.com/userfiles/file/86475167072.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/dugatog.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/tefilu.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/49440117247.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jut8cgmjhcac2gnbm10btqsgfb/17207162908.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/891bc1574f6c9971651266562695ce46/36113818203.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c1c0164c---dufozimil.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/livosaregupisu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f114473c11---34722331438.pdfIn PDF document text
    • https://phnews.ro/files/file/50896491620.pdfIn PDF document text
    • https://hiroyoung.com/data/files/tosanawanedul.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2305aa4b4---25706096614.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/liduzadapolodulames.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/70515227140.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/voruke.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f14de30850e---lufaro.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/benifada.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/vifafevufoz.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/rufaxipimozitemirapof.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/sawaguxisanibosebomewome.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/71226115735.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/sazedi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f958c9be722---57739663516.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aef479fb5---38153866096.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/92764381134.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be788b2ee67---38110120775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=specialized+enduro+2018+manualPDF 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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 11148 bytes
SHA-256: 094d800ed139fcd64b6e5a059ba136eb2feeebdd814b3c56ae81470222fc443a
font_02_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 16424 bytes
SHA-256: 8c7c332bf08ae74c48b2462d88cd29dbe53f733f88005d939b63ef6d0f19e302

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