Malicious PDF — malware analysis report

Static analysis result for SHA-256 6febe65bc35819e6…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 15:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 378b47bc08e6d3e2cff74c9ef5ca1fe4 SHA-1: 0734fca6c5411bcd4910a0bb09fc1d9043ff88f6 SHA-256: 6febe65bc35819e6c02ba35f3a5b8555831bc248600f7108deafb3178084b53e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. A critical heuristic indicates a 'Clipboard command execution lure,' instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands. The ClamAV detection further supports its malicious nature, flagging it as a 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://irlanc.ru/uplcv?utm_term=converting+pdf+into+image+node PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ckh7hahf58lic8ha7ir0rdmhcs/65306044636.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e661d267f9---20170698730.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/wetususokixanuninag.pdfIn PDF document text
    • http://entrackintl.com/uploads/67900088669.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/dabuzem.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/03pg8o864v1jm4bljpfgc1eg01/pizapowojagofevetafokagu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/bfbf21dbc2d37ea63f982e6c35716f5d/panozusan.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e8ed6499c---77214365031.pdfIn PDF document text
    • http://minipit.com/data/files/74162051070.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/afp92md209l69dcd11mk42bpso/77103270923.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/145014c5bcd96dd777ee7df80f306219/63458880662.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/32448718734.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/10148733996.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743b5f32c0d---16963123292.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6036bb4ccd99b921b644b5a262d45dbc/ferunawuzugorapizurelarip.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27943d52a---vefutajavesab.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/35672731105.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/hpsckgvs62bkmoldlfacpufbrf/fidapupasumemazon.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/27038532104.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/kalefupajekijebetil.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef70dce118---vizixetudo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e6o14f0tltstov6vo499cp2bfs/gipukatu.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/86600340697.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941eb1d7132---levixenajuxedenazexalebu.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_off0000c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 10724 bytes
SHA-256: 0ba35a6ff5a39d6fed2b59da206e876b0e25fd2e95f00afbbe4dbf31441f25b6
font_02_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 17456 bytes
SHA-256: 1956fcc8e41c73a22380ab0fbb6fab7a129ade29c3351a106df51275071a8c58

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