Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfc4483cecff5b7…

MALICIOUS

PDF

71.8 KB Created: 2021-07-05 20:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e4fce62d58b91b25943b7b79838dc614 SHA-1: 5a0ad470d851dbbc5f65d980df290ffceba69bb0 SHA-256: 3cfc4483cecff5b794079354d900a6493aabf8e80e67f20e97f19383ed869aed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple domains, many of which appear to be compromised WordPress sites or use disposable hosting. The primary goal seems to be redirecting users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://parklanehotel.asia/userfiles/file/funixozapuwi.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a7861d9718b---30115763027.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8b1ba08f9---43453447092.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc90eb8c5---dufawiratoveloragabuwuzi.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/43062659230.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5588f0f1b---95923598597.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nfruu8kv20r5keme48cueu3prc/62823099401.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/sunulagu.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/53648099379.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/fj0q2brvh30bh4pfogd1ocvit9/jopanorurewiguniderivuk.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/tikogagumidadabivitofenok.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ab8f4ce63f82adcbddb0b11ef2ec27a0/8827245880.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i6q1lccd9bfgau6jiht9duk4q3/6515640448.pdfIn PDF document text
    • http://vaikevai.com/ckfinder/userfiles/files/88720274922.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/08846220d0948fa5cc02b37064ac61de/jekomovi.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/54867435864.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8t5th0v8okdu5rsrj9q978610b/14241279570.pdfIn PDF document text
    • http://mega.kz/media/upload/files/deruboji.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/50907217765.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/47874222347.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece76ed386---59904734026.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/ladowinedodazasulapuzuxu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8fa8dd901b961923483ce1a625a48f9f/49249510877.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/sipitonakovesali.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/losowevaxug.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/67028310975.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f29e623c36---92934670381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=convert+96+oz+to+gallonsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB62 10684 bytes
SHA-256: 3cc178203e76dfe456a77978144a7508e742e3c1fc6f93ef6ed82b92c7303809
font_01_sfnt_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 14668 bytes
SHA-256: c8c1eddf85f8ee13b2c8afa1b8c632b425ed25bd3cc2ac1522ab6ea06dca3ffb

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