Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40a3c6426443be6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 08:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77969536312ce18302f2f5060daf9301 SHA-1: da8c0f6879f60400261d8eafc3b0f343f281a1a4 SHA-256: b40a3c6426443be615faf29af47b2d7f7a31005e30e768e628c0c7637b52da4f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites, suggest a phishing or malware distribution campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document may attempt to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wastran.ru/uplcv?utm_term=plan+tam+bus+montpellier+pdf PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/698189f68bb799fe51708e0dd1278cf7/mofewowajipa.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/bc4b41eb90e787f575e4b4b195139023/42405771195.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/27977907273.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/jejoxomopob.pdfIn PDF document text
    • http://xsteelstock.com/d/files/xilutun.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/954871b1a1298b03dbbcb07f7ae000cc/dufivitotenu.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/jorugoniluzuva.pdfIn PDF document text
    • http://congtyvima.com/images/Download/14186432908.pdfIn PDF document text
    • http://101balkon.ru/upload/files/58026924594.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe9432f2c---dufagedu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed32aae63a---44890374991.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gqqvmbb77qq7h22qsvr3u8l217/41502029829.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/lusuxu.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/47691798930.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/13580018638.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/55c2a8658dbc2944b62bc3180dc2d233/22543819557.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a028bd1c582---bojokavaxipiguwakika.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1ccd48d8---78968337381.pdfIn PDF document text
    • http://jarosi.hu/files/file/2384310259.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a690ec43847cfcd8613db8fe5fedf4e1/kenobe.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/letasaxototet.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d98042c0---wojewidavikedegodupon.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_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 18772 bytes
SHA-256: b32f0ede351005c4deb0dee34d434699eed6587a92d10b1252424ec63317a621
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 10900 bytes
SHA-256: 5b49fa0d99e37c1252230303226e630b3de337e3d5b37f73004c52cac4196909

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