Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f36936c412548b9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 18:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b37831ef7601952943550bb0e0d5c87f SHA-1: 5f9284726e0d44cd555f1b476eef2e5a95e85a15 SHA-256: 8f36936c412548b9b2026e1d9ef5c3f2532bab74144710e5b1d374dc138b851a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests it's designed to redirect users to malicious sites. The primary attack pattern involves using a seemingly innocuous document to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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://crewmak.ru/uplcv?utm_term=loom+knitting+pattern+book+pdf PDF link annotation
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/21323905099.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/64efc9867d5f41bc0f9c780c88e5d067/53889519889.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed6ea8542f---wegexedudofubemugogek.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/866a6bca080edc3ab7d7c9ed40cc5a9c/58444806081.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/51536507634.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/jefapopexuminatufani.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/22452506245.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/56324077783.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/660263066cb8b7215d3f6c0136badd74/tadalatifamore.pdfIn PDF document text
    • https://parc-hotel.info/file/75561519490.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/vawazixivokoxaremovibavi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/g2i6vprgucl08hqeup3nfgjtj6/wabodizaxesasaku.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/21317072409.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86066a5d2---95555275277.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/xifitidojixanizexabefofo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160878e82374e2---69718446081.pdfIn PDF document text
    • http://soc-in.com/data/media/files/30130007594.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70150dcaf4---jedib.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609771ce75ff7---gukorofumotefomonexuluf.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/63807757942.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac42cef2b96---nedukin.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/60610753578.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_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 10816 bytes
SHA-256: 90f67c9d7087cd0d229c9106c0acade3624228a86650c42f49724915be225343
font_01_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 17144 bytes
SHA-256: dde57ecc7650a23000ec5438d273c330866b9f057c7b8288e1b9265c8e35c9b6
font_02_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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