Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c079a279e65bd96…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 18:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b42be8b40d28a7edcc80a42ac76248c SHA-1: dad06af267978d01570f1b9cb8f785f197733bea SHA-256: 3c079a279e65bd96050a3aa237653bf0218931045c01da6c493939d215386dc8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL findings point to a common tactic of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cv2n244si88p7ft5tot3pnbupb/lunudidojiwepuropigute.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c4ac13468986a00bbf2615e093d74234/xexaxixazukop.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/add7fa976962d9bc4bd62e87e23d8436/33913251404.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36bfac36f---bapupe.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37db8a6ba---98336226583.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/87cac4d1ceca636d3d868fa97aeed84e/56957210171.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/dbe23192966039ec9a7d9a49377c79b2/dagexijo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1b375fe9577ceda245fae6e0aee5c0c9/jijawobej.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9du87c96af6d14ua2ansv8lman/81857444811.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/80s3s3gon48iqd9s86q3hk81mj/fesifazesidubepina.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/cfbd31ec6394ca9df0db3a34d3adf196/94920154009.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a16a4ea9add---31274024627.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8754a81539fbd261b6902d024da4d33d/xopewubojitemale.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/nozekarulo.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/71632733274.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/salamubunolodor.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/tevevagekazub.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25cf56578dab985a4d8fef2f049ac834/17333300074.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608759fb4be7b---nuvomesukajozakadomevor.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/vulokixefimopixeraxonisit.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e1c3f65d161ae86f0852bd6fb38f6b08/mafelavejogofef.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qssur94ntr6viglidv339q81qg/tumebud.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fc5dbb0a4b0e690c65ba4efd296708c7/vuzorodojimunepa.pdfIn PDF document text
    • https://wrd13.com/force/file/namujufexirivukuv.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/kuresezosadalixetemi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/184b2f9d2095572eac5d2a98ae7aee4a/donigisapirebosikozir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=baby+belly+button+sticking+outPDF 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_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 16492 bytes
SHA-256: 060de75718416f4eca81f41d7556c6c79787bd13dae77bdb21d17ad33b2416ca
font_01_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 10804 bytes
SHA-256: 21e18715c1b90846a87f208d058955ea3e20a7ab6c01fdc8d1c746d1fca05fc8
font_02_sfnt_off00013122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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