Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd0c53c4d5caf80…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 04:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9467908ecec2afcaa3a33430204007a8 SHA-1: fa80ad335f0a22b097dc0119514cc8ec2a9760c2 SHA-256: 1fd0c53c4d5caf8033f85269d281ba4d1d339c8bd3b6f4e4438dffb1b9ce7101
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript could be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=how+to+transfer+file+from+android+to+laptop PDF link annotation
    • https://funbugs.ie/userfiles/file/rimemelumoxi.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/dibemeki.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/90643621614.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/70407198315.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/72753681075.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/sezekefinujaduvuvuke.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/maxizizatetimud.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cd79367439d0fa542c9509e58a36dd9/35254198304.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/69365032143.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/xidekonor.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/39874391677.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613082ec9702d---86766580791.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/57637586037.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/siwevukafod.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/70780319558.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gamofo.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/bilijurezodogok.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/38048550690.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/76502063743.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/49624322193.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/tajirapuxiwo.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/2484281782.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377ac52774c---dutasenosiki.pdfIn PDF document text
    • https://777mto.info/contents/files/kizabe.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_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 10736 bytes
SHA-256: 26ad4a4b09bdd715d9aed0cac665a31d186bec03d34b0123fb61aed55b83995e
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 17160 bytes
SHA-256: bf2021a4b4c7a64ed80ac05475d605d6a0e7f3a127e8eeaed7c8bb1b67905c66
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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