Malicious PDF — malware analysis report

Static analysis result for SHA-256 4254f8e3b445f3b5…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 03:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab2b76ef9bb80df12e2cdf762ea5dd34 SHA-1: 1460b61d3432e8069e27f9bc924ce48146d911a4 SHA-256: 4254f8e3b445f3b564ec7bf6b3d3017ef10968c7ad18d824b42dc5f36809154e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate an attempt to lead users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a287963a---kepukopanowudirubug.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/134c0fa415fd003c6004bde9c2928825/talonakazerasezuxik.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7c910d0849e059c6af06e527fc8d092e/wuwakejaziwowu.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/vusisowovuwipamewa.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3eb6e2b6c23eba6b579e534670c25b25/kamufod.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/lumekusufabip.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a62629bae---fawijupama.pdf
    • http://hoangduy.vn/vn/files/junefozajuxisejeve.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/xufudujinerus.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6722728975---58645239054.pdf
    • http://perles-del-beya.com/userfiles/file/tiposejawivewolufite.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0c3897a4c---vexavof.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/gq7fv8ngjlnfmf832iei11k0l6/dogigakamaxejogew.pdf
    • http://asfalon.com/__files/file/70673946013.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095abe22fe71---tigox.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8579ab7425017e785ddb74b51277f0c8/limamavurigu.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5g0r26644mbq34t596o7q4rtr3/10278415508.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/8b600885f876d99412c73a0493496ac5/tijunep.pdf
    • https://aduanaldelvalle.com/userfiles/file/simegogiwegiro.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab700f4fa18---79449914247.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6faf284ce---54766680362.pdf
    • https://e-fasteners.eu/media/file/46040159295.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf43ceec8---83983915153.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c766ac4a---toboj.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f3acedb1b6bf425d35ceeb765788c1a4/dizaraxixezipefupibibuju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=too+good+for
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f014.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 16792 bytes
font_01_sfnt_off00010826.bin
784b99a04cf805005835e2006e96247ac079f2c219a8ef6869b1826f8106d5d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 18004 bytes
font_02_sfnt_off00013784.bin
a24ad66a15b811a1410a73a08f9a80579307939d9c11010b1af9053e1e413a6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13784 9692 bytes

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