Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b4bc354671f7a9…

MALICIOUS

PDF

75.1 KB Created: 2021-06-27 03:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3be627be41cf40cc29a56fc98517d301 SHA-1: c24368f478944c94f022e852605ebfdc3bb4b4e7 SHA-256: 81b4bc354671f7a98aab3006a2c19f558b6e39b2cc24bfd35cd83c682093560e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as a phishing trojan by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites and other disposable hosting. The heuristic 'SE_INVOICE_LURE' suggests a deceptive lure, likely to trick users into clicking the embedded links. No scripts were extracted, but the primary attack pattern involves directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607833a16ae1e---24758702107.pdf In PDF document text
    • http://traiteur-ribot.fr/userfiles/file/supipeju.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490338d0f2---sukusimizolajijumeduj.pdfIn PDF document text
    • http://goref.ru/files/file/35548479990.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/nuvudumulatojifemi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8fc1ae1d0---jusuzubobakowobifatifavu.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/voxiwefefumigesevopese.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/53ec6c461437b7f43b434b55c9b5f94f/xopipufudinugipef.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/nibuti.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076af2b70156---92868032931.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb820a3c3---11278870433.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/30517420361.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608f368c2ad7f---difez.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a46236b651efa168ee494bb6fbb8ce47/3592317333.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0ab12b27---6812317505.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1449989c8c---33263111961.pdfIn PDF document text
    • https://airbays.com/userfiles/file/poxonaresogokinidenunofe.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b487d33684e---63285085148.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d6ea16fc368a62b46763bb2688e3e93/44234463817.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d796b42530---34683594797.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c86f9e859dbd8a7b9e5f814c850bc921/52754025169.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wogomez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=2007+infiniti+g35+coupe+for+salePDF link annotation
    • 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_off0000c025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC025 16492 bytes
SHA-256: 0d70a691bad6101600a9f67291bf56fc6a22c8f33423c9610c87b6f8ebc59501
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 11256 bytes
SHA-256: 815eaa0b1c10d5f45c56eb034f437c636395b3252d86166f18fb6f7c90f39bf5

Open this report in the interactive analyzer, or submit your own file for analysis.