Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d87cd20525c1bbb…

MALICIOUS

PDF

109.2 KB Created: 2021-07-03 15:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 72d95792f4bee04ff658dd21aafa17ed SHA-1: 3732d48857174dbd2201373c55659e2f34575d7d SHA-256: 6d87cd20525c1bbb155f0087b29d048e60f7deced8b9512492c6657b2cbbf467
184 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ClamAV detection. The document's structure and heuristics suggest it is designed as a callback phishing lure, prompting users to call a phone number for fabricated issues like billing or security problems. The embedded JavaScript likely facilitates the exploitation or delivery of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://anandamsanyal.com/userfiles/file/rupezitun.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce20e537f7d---zugixujexutojubelusiw.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6ea209939a7805a43d0cbbaa597a844d/65337026097.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/frneg2ph2bfs20eroop59qdkce/48073650377.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/40748049667.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/30119869933.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/gojadixipotudo.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/78911249467.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/78852459152.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966b5bd674c---janotabilanovalenavomi.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3b26d21889023b3dba1c9b4be40a989d/nuwipewir.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/nivojiwa.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/5vl99dhj6agn14df5kgbr3on1v/xewireli.pdfIn PDF document text
    • https://chptravel.ir/data/file/wenakuzifisenofapizidik.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/46215313069.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7240451b4b587f241aaa4a957a75086b/32062855342.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/51rgmrfa18qg0qcdr7lr8d7qkp/kodinabiwikofejide.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609be10f30486---46035808035.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb7aed2491---larisi.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/woluvesowewovagobex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+cancel+a+paypal+paymentPDF 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_off00014a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A59 10420 bytes
SHA-256: caa9521a5cdf28294875e857a9105e658af17d74c2dfa7cec6e5dbc92afbe3c7
font_01_sfnt_off00016203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16203 17472 bytes
SHA-256: 48d3443496c79ac803d1a7c6eebf284d32955f440b38125df03108ef5896b738
font_02_sfnt_off00018fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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