Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec852f7b313c4a23…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 22:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b72d2129f2239f6bf272ca0f3f6a7095 SHA-1: b94824afc8c517e80735ebf806adea68b92e72e4 SHA-256: ec852f7b313c4a23c4af3608f6fc7dc5ad57917442c92110a6956cfb8638d691
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable domains, suggesting a phishing or malware distribution attempt. Notably, a heuristic indicated the document instructs the user to disable security software, a common tactic in malicious documents to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://fullcolorspandoeken.nl/userfiles/file/86538798545.pdf In PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/tupogejuzipugezi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51061cc83d---rawujo.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/2614298401.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/13682248853.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/vutadi.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/pulotaboxogepadokiv.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/kezifopadosajapakesije.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/63462656546.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/79819110255.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/daa2a4770fb4acafd0acd0c35926e8d1/48756802408.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf36836e9---71926922910.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/89193023033.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e219482150e269a6a05657852efe392c/jemuzezodixizi.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/xomijoxuvi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975b48604e0---xipapif.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/xenubuped.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/41980951551.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dcb5b6bc27---rokavigojoriwazibane.pdfIn PDF document text
    • https://unosms.us/userfiles/file/bujedagofovenofonil.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/gurapesamotipatukitawetux.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088354680b31---38207120193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=master+pdf+editor+5+crackPDF 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_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 10684 bytes
SHA-256: 427deaa383989b489ec482f855a773a1336af9e35d94f561cc4748fea4617731
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 17880 bytes
SHA-256: ccc6220297db7a8c2e52a3a5168c61b7c839beded2dfc76d1c031401786210f8
font_02_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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