Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd711332d5303d2…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 02:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73d8b401e24ec9f8849fd7486b4897aa SHA-1: ade934ea50dd5eda2862eb70e9bc33bf36d0446b SHA-256: 6cd711332d5303d25caee8d96e2d75ea354db574ce8d2210f91ccb368594a4ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. The embedded JavaScript suggests an attempt to execute code, potentially for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • 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://enidental.com/userfiles/file/20210908152429.pdf In PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210917173212.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/25168242710.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/fosipewosevu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141459a425f7---pawejekanejategewojefa.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/pemawedibosanelanuta.pdfIn PDF document text
    • http://cudicio.it/images/file/61915924096.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0bfb33f0f177ebe5cabc05f75fc2475b/61034806406.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210919041623.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/palijitugitiguzokiped.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d27bda4c609364a3e9d96c8f11f44db5/16970233767.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/kotenepiwiponuno.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/wofudebelubave.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/23307940260.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161489361a4043---68276493742.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/kawutijopuxi.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/6075v8vsgeup9ghl5knrrtbo11/70944574792.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/binepetitezewoniza.pdfIn PDF document text
    • http://machulski.com/public/file/54039779027.pdfIn PDF document text
    • http://classtool.info/upload/files/15408000320.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/39470568477.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/bigopo.pdfIn PDF document text
    • http://elpijisystem.com/file/58362337725.pdfIn PDF document text
    • http://malifer.hu/upload/file/jalesupidilapobejat.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/92612065746.pdfIn PDF document text
    • http://netart.hu/userfiles/file/92648979289.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/jotixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=virtual+android+10+apk+pubgPDF 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_off0000b654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB654 10744 bytes
SHA-256: 3b7f7b180d2e55443e943a91e9ed564efed37a27bf491ef04b3bef3adf93c0a8
font_01_sfnt_off0000ceaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 16208 bytes
SHA-256: bef2ceeed86e780f2dbe6083a47c7ef82dc388d502ba4bdbe278139169fe5671

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