Malicious PDF — malware analysis report

Static analysis result for SHA-256 071f931df5d3a653…

MALICIOUS

PDF

120.4 KB Created: 2021-06-13 03:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6e96691cf088929fc3a71e709e0fac85 SHA-1: f7671ee56fe4d535c2f71fa0f2c85bbbcf661ef8 SHA-256: 071f931df5d3a653a769b8a4a7e5736246c24fece0ab531b51f4fe22dca59f05
156 Risk Score

Malware Insights

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

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 embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these external links indicates an attempt to lure victims to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://philabc.ru/uplcv?utm_term=ending+sao+alicization+war+of+underworld+2 PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2b214b923ae4de4e93b5aca711de052e/37424760896.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/r3jjuk3fe6b7ricfgonj9eclq4/kozumebutagolefavivewi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8f11de35e51099c8524dbbed8d5cf665/gagebomasuwezojuwujo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607855f2dfa0d---71159480048.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f549efc5198a7da92a676d4de3fea48d/48153423669.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/xuwosubagafisuvujarej.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4a7c2f66---71831036880.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f0b6bf91---bamolewafose.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/64285066939.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097d8fb2b8a1---38069091837.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16073be4c0ec52---gesuzuzesotifiwisi.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/97148380528.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/29a8e3dd230880f1db694682d82430ba/zivivafofikesaxave.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6a23e46c525ff63bd1a3e31398f1d9f7/jazizenekevadidegaz.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/vatilexiselibikof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c59bc775c---duvixivamezavo.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 40872 bytes
SHA-256: 7650ab720586b450d45a3d87d51fabb4b60a61d904284d181848d7956a70e9b5
font_01_sfnt_off00017730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17730 5420 bytes
SHA-256: 85ee7ad4789ce985e6ae11d265a941bc1a4d2af954254c563fb436d03151483f
font_02_sfnt_off000189c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189C7 2444 bytes
SHA-256: 070683199a6f5413161e4657bc688501820cb7e13b5c62b4b9ba886901fd4a90
font_03_sfnt_off0001948c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1948C 12220 bytes
SHA-256: 15ba99af6206128a7b7ea16b3461e8415b158b4ed356cd326a8658275775cc52
font_04_sfnt_off0001bdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDAE 16136 bytes
SHA-256: b6b00cff465a81ba5268d07400ee0c05c1ab949093808ede7049c9f58c049a67

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