Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72863adec9b0ad7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 08:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ac69932882bfda917c5b7b9be270b55 SHA-1: b4ca2f313d98f57c5d5ef8be1eda2ab3c70b2331 SHA-256: b72863adec9b0ad7335c5ec4ad3756fb1afe69c54c84320f5d264139e27da26b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user clicks, common in phishing or malware distribution campaigns.

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://catamma.ru/uplcv?utm_term=sky+wallpaper+8k PDF link annotation
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/resala.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/84173579150.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/wanotuzomoveludibupizazit.pdfIn PDF document text
    • https://o-dance.com/upload/files/3850669466.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/39310084928.pdfIn PDF document text
    • http://espwireless.net/uploads/file/zixiwona.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/77694702857.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/palaneruwudeduwa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f613aeba46---fenemevanamazixezoza.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350db04af2c---paxuras.pdfIn PDF document text
    • https://masukpt1.com/contents/files/terobevanelevite.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/42144772240.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/27226665850.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/44766039069.pdfIn PDF document text
    • http://apvn.info/userfiles/file/21040491207.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/pumukekeroritikelatiwege.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/viweg.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/67511124063.pdfIn PDF document text
    • https://posh.hr/files/tibujemelawax.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/52571652172.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/86747980291.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/27129125467.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210905033606_etr21j.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tfaihb1hsrr062fgtd2m7r82a7/pimemabemi.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/83805212983.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_off0000cf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF00 17860 bytes
SHA-256: 74edd4c23cb2149dd4c24135facff10e04bb3076ef56778e5a99ca8040447803
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10240 bytes
SHA-256: 94679c566d408d819b9984011e10d994f9a14e88d11a9dacbe40b86c91022420
font_02_sfnt_off00011482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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