Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b8bb6ab906d31b…

MALICIOUS

PDF

90.6 KB Created: 2021-08-20 23:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49304a93933cf6bcef338cc5923bc180 SHA-1: 16f8841a59d8b2f40e084cca1ff621dc57c8b75a SHA-256: c6b8bb6ab906d31b46499f7a11e8b8a2ea7030056268cab8cb9985c505bd5b57
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 https://vinniescustoms.com/userfiles/files/20684329507.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a081f3a17---13699989125.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/16618473021.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/modevoradiz.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/39077015464.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/butameki.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kulatofawol.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ee5f11b3---nugugevoposiwivexido.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e5def207be9f0261995a9e8daf76f001/vopevesu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/qqg2temfah4au2afv1l23jh4ri/48678922627.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a25484208684a5771b6daaef8537e3de/muvepusunotugig.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/34bf66fa5c732c6118d44a6dfd1ca76f/nogatowubozubafo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8fbb9d77---pexureto.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b7e5492f56c14b1979255dabf0ead6f6/196094646.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/4768497146.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/11323446022.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/10e36eaeaf19744c8010fb7391005d00/35998268238.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/94f935d488dda162d564590477bc2d32/94805910683.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/latoduxukekuluzid.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jakalixo.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/zafakadefosadetalutem.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/57029422552.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcdfbd7ce5---mewojajijejud.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/vijiwevixugukejekovef.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2b954f4d---xudedesoribimazobafizakin.pdfIn PDF document text
    • https://geniodelweb.com/file/netofawewanulefifowifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=micrometer+screw+gauge+worksheetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 18124 bytes
SHA-256: 9c7b5c45e1b349c1f1cfb2040de967d70cf5afcfb05b06bb512cb90a4cd80e61
font_02_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 16380 bytes
SHA-256: 53fbc5ce9513e031d91835b3621b08c698a4e2412792db302dc4dd80bbbba9c9
font_03_sfnt_off000141e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E6 10796 bytes
SHA-256: fbda37e64ea5bb63d694fe6dfb4580bbfdb08233ce24866999b21ee454e805dc

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