Malicious PDF — malware analysis report

Static analysis result for SHA-256 164dbc473f0958b7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 21:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65764ace0476153249c444e0fc316cc5 SHA-1: d8546bcfd2b254dcbd3f6d1154e183e9430c572f SHA-256: 164dbc473f0958b7f463f6e2ce7921391588de3020857318300054911c05afdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a pattern of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=cpd+for+teachers+pdf PDF link annotation
    • http://fanti-fitness.pl/uploads/assets/file/wizalobuwisutaret.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/95516193684.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/sakod.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/riwadafinazogolidufatonek.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/70916350569.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abef9a5345---46056261704.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160869c1399edf---piwabivasuporikixus.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/62693334058.pdfIn PDF document text
    • http://2440027.ru/upload/file/15628732696.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06c5a9201---gozuwolavenukijisesa.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/ronafademomogijomo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/gigutojinuwulidotibigaf.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/44c675d3d19cf02371f75db91f45e900/70107678205.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210701_45C9010E6F0AAE08.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/04/file/20210704_175912_158.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818b746c1aa---6000720684.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/sifiwarolisilafupezema.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/49212110616.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/migofaxekenetezujow.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/62148021167.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f05bc5dffa---nejinexalalizunuripasokir.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609757a807ef7---92475755559.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/50233922451.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/girowugivekomaneta.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_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 10508 bytes
SHA-256: f551754679b89f043433af86e12c64254e444f554608e2463c55cb7146e69b50
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 17780 bytes
SHA-256: df2101f773de944493f3e6525c152050453edf531109dca44eb7ba355df9c334
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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