Malicious PDF — malware analysis report

Static analysis result for SHA-256 844e8e9f5c010d4e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-08 00:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a959001570d80db3c32daf39d9290a3 SHA-1: c9ba07ffea56f9c850eb0894e2d8d30c319da948 SHA-256: 844e8e9f5c010d4ea43f748e100e222fb5825b3d5f1616e2d2f9071b3a39ba02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or SEO poisoning campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crysiq.ru/uplcv?utm_term=grade+4+science+worksheets+free+printable PDF link annotation
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41025846d---birakudu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1bf4f044a---22592836835.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d478801c4---54343455073.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/8686427651.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4c09011bd314611a4e243ab0d05c6a14/bawulajawepegur.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/dilipurexukusafuvo.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/89881814376.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/g3fkada6qnjaru8ubln5q6v7ro/63224529389.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/bfcefde9d4a6e07d9f7b75a3b238448b/67041525904.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f108684f39---migugokadarof.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/migaxuronolemolofomepasi.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/wowiretodev.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2482ba401a---jajafigimig.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/0a0ed9d4805ddee4217fb333f647e454/85443860386.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/dudalemikidaziriwi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080e82db5e27---bejapa.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612cdb779acab---noxufejidarupux.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd5eabf9a---livotafexofajeniretipek.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6b865b0fdb8bf6af4e894fa7ae8da38b/jafozarawafiwepakexivimuj.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/favokuzidolebezez.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jgmsa6odsabtpt80l07iv9q4c6/34582751005.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c98f32c6494---bofukazorinumepekezatiz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5466e1bf6---vasanazexotogud.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/1449160838.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/wimebo.pdfIn PDF document text
    • 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_off0000b7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCB 14436 bytes
SHA-256: b8bb4b4ead6d03209c3b5324d45fb550ecf95d0c053ddc3d52b6ff604b03a4f9
font_02_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 11152 bytes
SHA-256: 657d775d8e3e268827dfb9d623b3227a2b2610005192e564ad64b43526ec3321

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