Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a12f81b7d860d02…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 01:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a8863d8604e7a1ab41165cef7acef98 SHA-1: 95dbe46fd4052156dd9e2524ec966dadf4ed68ae SHA-256: 6a12f81b7d860d0207909c08a27f26ae6deb75b600a7fee6af0c361672e73d58
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://hzjksj.com/images/upload/File/52154304633.pdf In PDF document text
    • http://hsound.ro/images/custom/file/lujulaxobu.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/zixiwor.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/zokijapobedeweginovaxog.pdfIn PDF document text
    • http://retrofotr.cz/files/file/33437310465.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612882a3165d3---dutidewubarakanutufiwe.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ha6dp9sg5cp7psk0b4spbt78t9/73561402634.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b983d1e90fd---zekidunelokusunuzifevisez.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/sezonitematirudenilojuwip.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/volul.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/87190837678.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/kefuluxukafabe.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c68a3c842---49153269447.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23e81eb27---82384957607.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210709_7CD735DEA4964CD5.pdfIn PDF document text
    • https://ikima.fr/uploads/file/fuvenepubikatenur.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/pavejijamixunedaji.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/zurebif.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/59453429549.pdfIn PDF document text
    • http://sparkpro.lv/content/file/55331409227.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/dojasolelibunugetik.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/sogumab.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16125b2f65f32b---nabogubepozudokezad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=grilled+cheese+and+turkey+sandwich+caloriesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 17408 bytes
SHA-256: efacfa3e662f256ccff9249c3a49f8acb0bbcfe4bed5cf5608d0a93e92b681cd
font_01_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 10896 bytes
SHA-256: a7f7e914466d9c9fa4ea5753a1983b2b72c8becd087c12a21ab4a7b132585490

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