Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc6068553de7fc4…

MALICIOUS

PDF

81.4 KB Created: 2021-08-28 20:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e8abb216f13703ccf65472657a69d20 SHA-1: 23d481fa9b0f214d420f36ef66c64d3b84ab2364 SHA-256: 1cc6068553de7fc43907241f5726e696c42c3d0c2a6f85b6c1c3e13a7e52be66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://amd-export.com/site/upload/file/jutopofikewabumi.pdf In PDF document text
    • https://paklya.su/design/img/upload/file/nodopopimubedunuvi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/likusel.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe084b76c---68727388706.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/gakedewof.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/tixogegoroxarexigivukotol.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/040c1479c63870bad03d3811fd20759a/pumibajoguxigaxov.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/kesatikojolozosutawuf.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/paromavudubotekupotaruba.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/v5d36ihv8dd7jdanilpe9gkq0d/gutilozaxalomedop.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/14036024753.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/pewawevolajedufijanoxoger.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/20a151e7278f5ef1fabf54da2186be8d/30433439159.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/korexow.pdfIn PDF document text
    • http://citra.cl/userfiles/file/fadupedabojevagujijetuzi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088cab62b3e6---72165454467.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d41689e95d---40715190356.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/finagamefa.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/70337044952.pdfIn PDF document text
    • http://yoron.net/up/files/wifuvumudojujuv.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/473dbd9aac6fdc10e5266f79bbf31c01/jeviwomelapitelurirolonu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e76759cfc---mujefixafotokosodiwu.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/2d1425b0ebf993496889aa1a9110affa/20201371465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=complement+in+latinPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99A 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_01_sfnt_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 1920 bytes
SHA-256: aecb050619ed84714e5a17c4200e3ae006f3951cad91f38699cfa90daa2ad6e3
font_02_sfnt_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 18284 bytes
SHA-256: e870b52f44fba535516932f578fa3f23463e6e89ef5e4be44b0a41e8c5b6ef16
font_03_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 10176 bytes
SHA-256: 49f527d2b0b8af8e7df56504e5ee8f249cf3e24d42ba495a8dadd0ad82ff7a4a

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