Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbc5e33ea5531a6…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 16:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 393c08e09341fd428eb19d0796e219e0 SHA-1: 6e07223469ecb276374dda83764af28932afc17c SHA-256: 8fbc5e33ea5531a62e9915347adfae9b7b90ce06f0fc45fbf4800118f2a6b73c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting domains. The embedded URLs, such as https://nomylo.ru/uplcv?utm_term=pirates+of+the+caribbean+5+dual+audio+720p+download, are likely used to distribute further malware or conduct phishing campaigns. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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=pirates+of+the+caribbean+5+dual+audio+720p+download PDF link annotation
    • https://f27szerviz.hu/upload/files/xogudaxemazoribikerugoluz.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/gkjv8813svhjldk0s1eq3hjlsl/56845686651.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38465121228.pdfIn PDF document text
    • https://asken.as/bilder/file/xijoveju.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/19046391318.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16110def7826c5---94699710963.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5d51933d6d708a581e28dc48a498d1af/8082340798.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/llkhobhp6amp53hlbb3oi4knsj/85055691142.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/59185519548.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/vuvutoxadujoluja.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b4057b07e23---zutabalu.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/kanudefejopifuji.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/21851315682.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/31326051705.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50af4f6ca---fuzakavarewakid.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a5b697c1---69564811197.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/kemerogajumofewanepobutog.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161173eae60a8c---61646949832.pdfIn PDF document text
    • http://22743333.com/userfiles/files/22866989865.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/zevudakovare.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/croqpcg9vus8dtd1s8sic8dgbs/bowukudegeb.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/281505428639.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/momevuji.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/0f3e060abe674b81204211db9120b039/93615491431.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/80561813699.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4a8446062---zazaji.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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 11472 bytes
SHA-256: 070e70681b0954f0d9c02e2b1a07a38efb7df989f811d8cdac3a329ddce5f7e9
font_02_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 18856 bytes
SHA-256: 6380e3218d2b66d793b0efedf02c96882d661806010d6dc2bd3f99d31aee570f

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