Malicious PDF — malware analysis report

Static analysis result for SHA-256 651d13d1c0f92f79…

MALICIOUS

PDF

78.5 KB Created: 2021-09-15 12:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ccc110235ca720a3fc6145b93264921 SHA-1: 85cc5accac3ca5829df391c42b0d6a99cdcd9329 SHA-256: 651d13d1c0f92f796d752cee131574520e30d98517ad433d622db59b5ef6af55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead users to malicious content, likely phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=rick+and+morty+full+episodes+season+4 PDF link annotation
    • https://iwanbim.iwan.co/userfiles/files/devusurukezexodimajuzoden.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ics490gag495s54vv9mjlugsi9/27607491641.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/68472571919.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/38840463790.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/zesamakoneb.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/lavukewo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9d3aab911---waxusuzudoweju.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mosanurifewavebusosal.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/kijorasinogefuweveku.pdfIn PDF document text
    • http://afro-safari.com/upload/files/xinomafixamutujadozuvot.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ddbdc146---folafimivawof.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/refilipamadideseroxa.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/84871713012.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/76133973947.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/83153387631.pdfIn PDF document text
    • http://samtle.net/ckupload/files/zoxawigewuberegujaruxuxu.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/70694263369.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sozajejobisaworinepa.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/bamebimowajopi.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-14/20210914185025598642.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/12802334858.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/38065984483.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/51204662844.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/44600012165.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb14cba99d---fuwopixigujo.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_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 17760 bytes
SHA-256: e55cd03e4167a5d37764581110025728814af983ab21f0bfb1dabea8313968aa
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 11208 bytes
SHA-256: 4c1aafcd55c7ab885c3eae4c5af1c6b4bdf284e02a7c754c4602771909839e90
font_02_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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