Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a54d24a08a8852…

MALICIOUS

PDF

101.0 KB Created: 2021-08-10 16:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc16731f8e43c8b5042636579ab2a0ec SHA-1: a0125a918365e64385d12f587707641ced5addfd SHA-256: 04a54d24a08a88520b1b050ee4d0051e6281ae3b7015e97fba8b212ca9cc3a4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=free+medical+biochemistry+books+pdf PDF link annotation
    • http://korvet-sp.ru/userfiles/file/puwowozode.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/mejuxebomal.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesagoturuzejef.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/10513312832.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/tizigesesinirezapezemo.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/41016921004.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/cb1082b94a52cc42077de9702d883b78/88878951437.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/36346780989.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/vixajelowi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/jh0vocgnqril45jp2sblu36s7b/bubavejuleven.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4802af4e---rojejusorimemuwovixutuvo.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/21048228342.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d892102e80---22841443895.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/kukobi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/67755742130.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/lugigeniduwowixejelagi.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/54188190605.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/duzakuwapusuv.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/birubobix.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b59b2d3f---28372835405.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/8egulr293q09begdbq47pu44t8/zenokokexarubox.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16103aec1356b9---gawezadawunuropovodijox.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_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 18836 bytes
SHA-256: aba84266b8278ff556336ead858a285055ebe6edcfa1e9f8ed4c23e7cc0908d4
font_01_sfnt_off0001536e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B85 11104 bytes
SHA-256: c2d5a8f51f4773603f67c7f236000bd0df4c89058d8af0cc488697cce3c24e59

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