Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cd06fadcbf2c68…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 10:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c970f78735f678fd15632a34d36260d3 SHA-1: 20bb9160c0238ed0a9eb571933602ad93d46a9f1 SHA-256: c7cd06fadcbf2c68d434468a016abdc84e00f047180090af7e691fc01447918e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm on disposable or compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://cructi.ru/uplcv?utm_term=can+we+increase+ram+in+tablet PDF link annotation
    • https://nusbetaja2.com/contents/files/botofan.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/duvojaralegupogozumido.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/99680057865.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sjunpqhm4jpqs301c4ne2opu2s/sasonetuwetuvavepimujuz.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/fixolituzuwubajoru.pdfIn PDF document text
    • http://domuran.pl/files/file/jugasew.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/16162739468.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c153483a9e---55831383201.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/3646922841.pdfIn PDF document text
    • http://newcityhk.com/userfiles/28535171890.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/8639219417.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/72465019041.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/25726815232.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/mugemutakeb.pdfIn PDF document text
    • http://zl369.net/userfiles/file/61973658569.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/bopigujiwiwuguwujuju.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/49557368165.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ef9754066b443f0c615634a3db0a3fd7/94566729982.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210909_75864FD11C11CA57.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/80329720166.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/58871399593.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/bodubowanaxowawi.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/59706821339.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/pemunarexoduxurodis.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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 17892 bytes
SHA-256: 723a9a063a9084d0e4df81478bdac45550e62fa20f1ee73102faa1b1b8fa00b4
font_02_sfnt_off00011e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 10528 bytes
SHA-256: 5be4ba24114dfcb5b15c758c622d50b90a63cc09eee056ed0e007a0c97112e6c

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