Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41935286e871f32…

MALICIOUS

PDF

95.6 KB Created: 2021-07-01 14:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49eb673b32fd441b7f976951ff39ec16 SHA-1: e2652a1d2e776d3b976fa862226c3cfe6a90be06 SHA-256: f41935286e871f32020a3b9c900558a44c6e57785b109d15445ec8e0a7ad2867
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a heuristic firing for disabling security software suggests an attempt to bypass defenses. The numerous embedded URLs, many pointing to compromised CMS upload directories, indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=clicker+heroes+mobile+save
    • http://campbellelectronics.com/uploads/50516563966.pdf
    • https://vieclamday.com/userfiles/file/55963191203.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a6e12ba0f10b0f6f71807da7adcaedfc/nerevegirugofavize.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa515388a8---23442207938.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609da0ddd0847---vemovefu.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/huu1kehddj0870epevlnjifscn/fogavivowafi.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c078ebbf63---zatilarefox.pdf
    • http://barbusci.it/maisUserFile/file/88831002564.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/519d036f7bb9fbab71fb29283e809481/47684085446.pdf
    • http://backupcenters.com/userfiles/file/90643866029.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7602e6a02---noriperebibilumutazo.pdf
    • http://jaika.in/images/documents/files/xiragevapizedosez.pdf
    • http://gialtour.it/themes/userfiles//files/besuravoma.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/5742cef819e867cb4e6c9a61474358b6/98397193741.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b84e47ebc49---gagekem.pdf
    • https://circolodelpistone.ch/userfiles/file/52534730567.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742ff487e2c---kurukifo.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072024eb984e---85309398922.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a220b2c8---93984991156.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf15799890---31625422719.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b92c6882---52783975497.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/14d4c1631f9adc5d1d699a32df037fde/wewerede.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b61948c11---dulomidirejubanovedamulu.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/585447122c74b5410c9803dc5e04008f/nizil.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/l9rc5koe3k66d7ajjqbo93hc9d/gofome.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f8.bin
97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 16192 bytes
font_01_sfnt_off00010f84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 16792 bytes
font_02_sfnt_off0001279b.bin
0bb5044df9cc1ee51f8a2421baff4dbf5b90a47275857e790182985be25d67e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 10624 bytes
font_03_sfnt_off00013fed.bin
0ba156b837a1b98cd0e2db564e25f2603d7badd4ef37e474ca136ec76de1baa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FED 17780 bytes

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