Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e2f1366f597904…

MALICIOUS

PDF

104.7 KB Created: 2021-08-10 23:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6da270157ef4aff176db527d0975937b SHA-1: 7192c38dc9e462c7284d69d465e3c6e5f45b4750 SHA-256: 36e2f1366f59790482e3a4921c2237b7f6fd13ba62c13e71c58b22ae48166e4c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=new+bp+guidelines+2020 PDF link annotation
    • https://dvg.asia/ckfinder/uploadfiles/files/kenivebiluro.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c544bf3a4eed4f40fc6610a06562d17/80942858685.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40c8a8de3e---75459308329.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gobex.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/binoxovigemefufuxim.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075bfcf99712---46826841132.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/zozonip.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075b52799419---6966898447.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/xamizen.pdfIn PDF document text
    • https://kildevangen.dk/files/29312944319.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/5416c6b55a00c473e1956c3a49e25207/32323798383.pdfIn PDF document text
    • https://coluer.ir/documents/file/65546495242.pdfIn PDF document text
    • https://fasaac.org/temp//files/88830910893.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/67364717264.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/virekakipe.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c86f9e859dbd8a7b9e5f814c850bc921/52754025169.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/dekoxudikakalesaretis.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/bekalijajetenej.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3gvjqpfb8f7hv9q6toqp5pdar1/90246241079.pdfIn PDF document text
    • https://wagaskar.com/media/20319764874.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/492d3ec23fb80d71eb94dbe5073f833d/99958147715.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/tomakelojinase.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_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 18116 bytes
SHA-256: 6e8f18160daff09ba9f05d99efafaf5e35efe63667e1616c37c2fe22c2ae1480
font_01_sfnt_off000163d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE8 10632 bytes
SHA-256: 9ee423064ed05837c71bc728cc432bb2881bcd51fd1eab74ac6be9dd85746103

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