Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a26cdbb75e9901b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 07:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db5ba3cc70befdd88b857b33d92403ce SHA-1: e241b795b05dbfa45624317bd46ae9d96ba4d9b8 SHA-256: 3a26cdbb75e9901b78a0193f0b34dca95b83f5996dd0dbcf7c13d587a08076f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was unreadable, so the primary evidence comes from the URL heuristics and malware signatures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/95d1p7s60q536fcjpi49e8shun/nidojagidopusevidob.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/924e0fd1b306bed75b59c3371a60aa11/70102860384.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/mezetesiz.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9203f1535dd104bbf82a37e6c4271a91/kefujixusalijotelijipolod.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9694bf5e---4108185348.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa569700d7---mefonoduno.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/jalodelidajopowubu.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/dipanigokima.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4e14ab952---sozesuzawarabeven.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed0214e8a1---49028666770.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/15341004455.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c4f85b6aba893fb6e6924bb6cf74764b/15270522617.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/29152202673.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210721062847.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/17105365909.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/dolojarefobizoput.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/rigarosobimabena.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/rikodutukenizopubevaku.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607581abf2371---balapid.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/gojuj.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/sojakuletozuveruxite.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922ddf968fb---82048858434.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/89918467585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=plc+programming+using+ladder+logic+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_off0000bb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB83 10968 bytes
SHA-256: 2eafd62d2e2343aa030376e8e1523aee923e119f3de75176bc850cff776a4d9d
font_01_sfnt_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 15096 bytes
SHA-256: 39f6cbc3d71a35c74708bf375420af3f9d3bc7344757e43e08938c2d67b0c251
font_02_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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