Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ef85e4f47419db…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 01:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48cca9404cc84df593164421cca17a3f SHA-1: de319fb85e47097bf7c89f51a7a56d51aa1d05c4 SHA-256: 66ef85e4f47419db61c8f604d27cb2c6a33426be57cc62a2ccfa65025c75f9c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely as part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the structure of the PDF suggest it is designed to lure users to download further malicious content, potentially via JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076cc3fe1f3d---jowidoloraranuxazab.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/06039c17d500e65462429b720287f1ee/povawasegivojexaf.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/31611643285.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/71675387346.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/5045972507.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/vuramubafajimini.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/boziri.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4087c90828fee3ff282c784d4adb6975/940753733.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/57948981500.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210801054750.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/wuliroxekatexufi.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/57145644785.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/62353936853.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/27410d42163c307444fc5d9fdfc48901/selatak.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/26412788337.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb50e0f8fd---kamanukigozipidubobeg.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6037bcd7---nonuvitajo.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/fe6d0c16c7f54bb411ac81a4fa60b74e/mudorelebure.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793d4ab655d---56110515407.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/sirinakadozukiso.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/fodokaduvo.pdfIn PDF document text
    • http://cissi.it/userfiles/files/sumubipidan.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/fumerawulimole.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4386b8e0d32fb0a479e3f3759e44e352/sefagejujikorefex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=payment+settlement+act+pdfPDF 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_off0000e39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10584 bytes
SHA-256: 9b6d9cb059a6002a93162f61a53eb353f16dd600f0258c1a53805a83b908aeee
font_02_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 18412 bytes
SHA-256: 4225fb6da6855cc75321bb5b6761bebfc1b1c3d823efbe34e56b5788d5314ba8