Malicious PDF — malware analysis report

Static analysis result for SHA-256 041ada1c28f073e6…

MALICIOUS

PDF

83.6 KB Created: 2021-07-03 01:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d8be860e46af8e51fcb5a0c8154a6034 SHA-1: c9048cc3be4beb6c82be4fb99e085de315def783 SHA-256: 041ada1c28f073e69a2c6b7bd63cdf3004f46c7bcd5ac6c4bf51cb9392c7ffcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=life+cycle+of+a+frog+ks2 PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0aaca3de0---82664277096.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/jasipadulinufukuwiwo.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/38965339976.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b3d8091a3b1ed35296c70ccabe7c96ff/50906481634.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077909ec5a30---14812790662.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8bd21a0ea---weporofikojozi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071984dd9ad4---88508771218.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/3509463386.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16223011860789.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/xezuxinaxerosibatomerovu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ja1pa4gvgv60nk740e4osv2tct/55169795832.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/mpk84t59etgalvp0o5btbg9lc4/zelivuwagukebapezewoke.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a586497f972---30023353818.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/14418837527.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/22453156128.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/i76jd5rlkrt20ooerc6bjpqf83/48307235087.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/20543675200.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609375467dcdf---xanebepasofego.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/99709766985.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160887aac19731---dubefakusodo.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/6hhi993aus6j5q1hn23gopjk0k/73459560838.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886500e837c---99089074624.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/wovopixavu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6a0e649f---xumevolukanetulilujeku.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_off0000e446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE446 16616 bytes
SHA-256: d55d3654a77d2fa9a457375e7f8c5877013920b1a47083918abd6a718dca826e
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 10592 bytes
SHA-256: 406b47eddc9a833c719a8653678610b340d7ac04c8b5a5714a4f94d0a035c95c
font_02_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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