Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80e4f8f71a749a3…

MALICIOUS

PDF

83.1 KB Created: 2021-08-24 19:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 70aa41ccd719f1738614b20077582806 SHA-1: 30d0a9bc29fe53b60bd18d4c513cb9ba6b88739a SHA-256: d80e4f8f71a749a3f019e5c03c69bdbda0c5b74d101a51adc82ad70df9a4a52f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://laborke.ru/uplcv?utm_term=what+is+a+ct+air+mass PDF link annotation
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607825cb28544---dawakelu.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/84048606661.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e1299447822---sawajugakijakuju.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/37760717990.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/77777924545.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/20766069891.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0d95f1d81---pawepebijipev.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210609031020_1673987854.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cbf9cb82c---gufekefugunolumapu.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/21201857175.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/11268121458.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7078731a---bogikanilidobibisurirazu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/97d31d973028832abfa8e9dd9805a8cb/xibinutusawa.pdfIn PDF document text
    • https://coluer.ir/documents/file/bipusofa.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d5c3cd94---12911604098.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/71116948290.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xepidavosaxapenesuvubu.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/97547380173.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/loroliv.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/segonosegekase.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa1063a13---zojubugixukasidoxuni.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/54731506909.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pil5cn6enb0ctbsif95qgap2e9/9338816480.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50e3dbf7d---19187131131.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/37351728063.pdfIn PDF document text
    • 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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 18904 bytes
SHA-256: d8d8ab8bc8b8bcbe0e5bc4e80eb93d6353ad985019ecd87e40c3a908058cd8fd
font_02_sfnt_off00012816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12816 10084 bytes
SHA-256: 6ea81e4b0329ca38d345c3fa07445730296e4701dcd2464b9b0733bb619c7c48

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