Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea4ec600e0f282f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 05:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9e10d33db9d29bef785d036a9c3873c SHA-1: 8b24b248e3a5a4ba6865be30d376ad0dc0949b35 SHA-256: 9ea4ec600e0f282fe19ae9bbd6079fcfac0c97ad112dca25ccf60155bc83b178
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the 'link farm' heuristic suggest the primary purpose is to redirect users to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4d64226e---mutefo.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ea1074e4a---91652058879.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f76e158523a---rufinuzigizoxesifiweruzod.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/68426999475.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/63509633090.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5fdfdc8127df43a8ee30d9a79557fcad/46907146109.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/buniteluberoselavuke.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/epalsh9ma525hm2p2g0fpsduph/mefofopafu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f279c624c2---xoxisiso.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/9806568876.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/37038091459.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607045a9cf5c4---78632497913.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/84305317659.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o8n3sa911fe2v605ja2c0fsa96/88133145253.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/bdg82qvdpqegdeseokht8a8hv5/kenikivorix.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/mowizukojodagug.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d3f348e53---15454530907.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/35205290075.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/nubutelogufanifetoras.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/sewoteraxanilifiloluva.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92ca751a3---galugidudenil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=shopping+list+for+newborn+baby+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_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 17280 bytes
SHA-256: 84f3f2e206e2a558c269cfec3215cafb591f4044dcd548c254190991c40a8d64
font_01_sfnt_off00010bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 11192 bytes
SHA-256: 68838133e7bcd773442637f88b7cc38fe3afab45e508ecc68a9c07ad876814b3
font_02_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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