Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a7e4ea74bd8dfd…

MALICIOUS

PDF

104.0 KB Created: 2021-07-20 11:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d433418685b0e0142ff6ebfdb71f49c8 SHA-1: c9fd81b2e743f5be410db3a6b93b05a6a4bcbf8f SHA-256: 94a7e4ea74bd8dfd3e0e5e2de6a97817e23095e630a8408e269413088d0e8b94
156 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 heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests these are likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 6

  • 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.
  • 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://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb569d3604---10142005206.pdf In PDF document text
    • http://tnslib.net/userfiles/files/21046381894.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/xevezizelebabiviwada.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dc84e532---lajiton.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/nemamijugasove.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/30570767621.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210510081519.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/70c92cd2a7579d4be77cf4e2a011abcf/wirodi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee298e4af51---14006415440.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/nabibajuvunafufotijel.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094320aafddc---dumifipuxemolirax.pdfIn PDF document text
    • http://dzbnf.com/upload/file///98190247122.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e99e68fdd3401989e9657cd353613938/tifijivutup.pdfIn PDF document text
    • http://apsons.eu/files/file/61599943011.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/gosupodow.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28437464199.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/89190132651.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7aaee0ea7---xutop.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/50592684180.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66aa9b4ef6---99805383432.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5b086berm97agttare3aav141t/30004538055.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0f51d673fd9a1b40ad7b429615d635c0/zutofemitox.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/25655c59df38a6065c4d252fbd0e25a6/28253528249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=conquered+meaning+in+marathiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 10760 bytes
SHA-256: d030d74fa3565a2bb584c53426131b52384e7bd7d3c8adbf8ce54bb8a86f973f
font_01_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 20532 bytes
SHA-256: 2288f782b4ace836bf66344804fc2fe4366df73a937583a0a70f564ce247737a
font_02_sfnt_off0001570b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F1C 16368 bytes
SHA-256: 06d77d509b0dbe6de9de98bf6b9c419635a9d634e1ed894637bb2ff0c4902ab5
font_04_sfnt_off000185a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A7 2336 bytes
SHA-256: a18af65b2c4bc2e45b2cd1e2b08f088fd5bc101498ed747f4165bf01a4717385

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