Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dc321128623050…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 05:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fff03aa8b23db9246aaeb2b42d97c80b SHA-1: b731cf2b35b67cdb41e4a9bafbfc046001ef9687 SHA-256: 05dc3211286230509241f2123d876b0302547ca551231afa6c1084bdcc5b0d04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=colour+vision+test+with+answer
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/54fd0fb54c52d0dcf61013cecef688c7/64904161074.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d3b4ba63---tofubefe.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83806641738.pdf
    • https://contactfm.be/userfiles/files/sefegejasilesi.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdbe3191ee---juxuzuvijixijosibowezazi.pdf
    • https://standardpromotion.com/images/upload/userfiles/files/rorak.pdf
    • http://domeinbeverdonk.be/assets/files/file/21891242259.pdf
    • https://hondamienbac.vn/userfiles/file/75758582149.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9aae1b70---51776254062.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/f71e8791cc81af65ed07397a74a3818d/webajow.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160811fa9509b3---41597294759.pdf
    • http://cpgny.com/userfiles/files/58029828342.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3a7dcfd6---85506602573.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b960e5125fa---26447510422.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607754ac69a79---25619942470.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160901bb770c9d---ledexibupokubu.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba1768a03---fuvodebupigujaropisa.pdf
    • http://murphysbeads.com/clients/54316/File/xidaveremewi.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/9a47e29c4ce82867f0de83717c3835ee/49720880093.pdf
    • https://contabil-fiscal.ro/mm/file/2161894553.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7d2afd51---buvosunerixijiwetanem.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607abdaa9300f---mitusademolevefokejer.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/83btdvuof9egfnnj9auisrtb2r/sajimuwafupiledeju.pdf
    • https://baongochoa.com/upload/file/nisufi.pdf
    • 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_off0000f72f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 16792 bytes
font_01_sfnt_off00010f41.bin
08eee6f7a0c7df895c747f5b940e74cf58f5adbe456952018eaed1c21aa274de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 17840 bytes
font_02_sfnt_off00013d87.bin
0620d8305ed183333db9761b2fa19255f96d8a3c4662674f7581bc3b5f60fbe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D87 10488 bytes

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