Malicious PDF — malware analysis report

Static analysis result for SHA-256 404e1b739d33292c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 16:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f4feefc7ad6c1724446375aa75f9705 SHA-1: cc58f567548bfd50a6c2cfe3edd7b6fcf2fdf32f SHA-256: 404e1b739d33292ce700e6e3a5cb6aa6398b9284afa66dedb4b789c2a82e19eb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The 'Remote-support tool lure' heuristic suggests the document's content likely instructs the user to install or connect to such tools, a common tactic for gaining unauthorized access. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sfeerweter.nl/userfiles/files/midaxebumujud.pdf In PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e819f16e94f---rixusen.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f0e7326b891cf70442cf28a2e936cf00/61529500553.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115ac58510ce---41692447544.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/68383856792.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160739a547a36a---76275039418.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/9741054029.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/81409488091.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5cc7de814---82186902493.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02f4ac339---bosisab.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/36390316938.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d0db5970c---wekufofenefa.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/2617437752.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210723050850.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/f781c9c5a2e5061bad914a606930d990/verexuvimisetef.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/nipimat.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/2f33abbaf51af74effa155ec24d43c75/51444150364.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/fikigotejisesosejunefuwin.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725dfa818ed---90686706786.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/86439964648.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/73694885519.pdfIn PDF document text
    • http://roocenter.ru/upload/file/levenilodetib.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/70510968202.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/89103268265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=contactor+fuji+pdfPDF 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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 10528 bytes
SHA-256: 43c81644a142f30a09a0abba9ac30eef0d4d092c61179b35d1fe9d401e5e4ed8
font_02_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 17560 bytes
SHA-256: daa52d4fbd95426283ef09687ce3c92ddc07335206bf2a817b8f18fafe3e5a46

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