Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6503469efee2e6c…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 14:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e026e54a7efe6ad4044da1aaf60e387c SHA-1: cf6fedcdf6913b6d99924ecdca6b84daf3c0e97d SHA-256: b6503469efee2e6c695f65fbcecb4484817e3e876f1ff28156099b264fd6a0b5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic specifically flags the document's intent to trick users into calling a phone number, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ketchas.ru/uplcv?utm_term=imei+repair+redmi+note+8+pro PDF link annotation
    • http://woori-tour.kr/FileData/ckfinder/files/20210921_5D8F91B13E494ABB.pdfIn PDF document text
    • http://floramarble.com/uploads/18235417394.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/59903912892.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/68631490714.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/xexetalekum.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/lazedamonenosusez.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/95510994960.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/85238493107.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/88921635009.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161366ba23a9eb---kizodamakonuxowapa.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210902085331896715hfv1ht.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/18549361945.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/21244813046.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/44121231275.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e098ae5ce478a6495b1c8880749f7462/ligegidipowatanenikodu.pdfIn PDF document text
    • https://andana.us/files/files/wegelinaratofefu.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/fugesubiditogurixis.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/masusifata.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4dd5fd3d---68908202921.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/vitatulesibaxutadaker.pdfIn PDF document text
    • https://dcimx.com/files/bivufanutixifi.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/15032435555.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/moselaviwirafilixasur.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/urttpvravd9j1bicboaenh3hur/tinumukomazogo.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/79995499756.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_off0000b66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66E 17876 bytes
SHA-256: 992ed058720d34c5c9398ea542b2d779897d49ec24a87fc423d8fbd273944156
font_01_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10500 bytes
SHA-256: e11a3cd6a15cd1ba5e52a878f2bf14553cf9c62a127b845d42f71225f6643814