Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f0ddbc160d5950…

MALICIOUS

PDF

96.1 KB Created: 2021-08-13 13:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbf60f10e3f389705b551b2e4f54f462 SHA-1: f7af0b64b9919105533a05d5e9b1a3ceb8214bff SHA-256: 36f0ddbc160d59503a1bfd1d4f9212d19ed0d04dddf850b62fa50f442cecfa9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://coretry.ru/uplcv?utm_term=how+to+cheat+on+gre+at+home PDF link annotation
    • http://abwcrainhwy.com/uploads/files/85865282207.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/jisuwejepitaxowex.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/16697744234.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zididetuduxizovuvakulivig.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/21748809706.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/xogiwuvozud.pdfIn PDF document text
    • http://hkacca.com/userfiles/kunok.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210602234512.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/ritata.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/f1u9v93je2vm28p4ktc2r45adg/vusofedo.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dropslues3n1f721nvdu5a09r2/89769608688.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/92539068657.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/seluke.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc86d777e98---55284678531.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/1313863993.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088e11f50833---rugolon.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/75709052723.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/6242471454.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xuxejuwilotazekikodixufa.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/xapuxokiwawisepusolapiwo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rexugunixopekekevikenaxev.pdfIn PDF document text
    • http://chikatere.com/Upload/files/lesetinuxenunonezaporowib.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e6c19f5a0ed79ba28a29045d1a78731f/vezimibabi.pdfIn PDF document text
    • http://www.polni.si/Images/files/misarefabitisaguj.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_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 18376 bytes
SHA-256: 3e57de67312d8da3117bc53fb93e0fe9cb91ab3db72b3da8e8810110af135f6e
font_01_sfnt_off000140be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BE 10448 bytes
SHA-256: 922c4f986157f1e1a7c1e42f5ba62c4f75ecf82fb1fbc94bd97368bc2fb0aed5
font_02_sfnt_off0001584c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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