Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4747e32e17bac7…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 20:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3bf72073d2a562516f7cbfd558d542c2 SHA-1: 32361cc998b842cb7acfdfa5564c114fcc21fb15 SHA-256: 7d4747e32e17bac739ec591992e3d7b55560f30646c9c3bc7efc231ceb73a28b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to compromised CMS uploads and using UTM parameters for tracking, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tuclubcr.com/campannas/file/17518066134.pdf In PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/kobinixazozegilofupax.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/jenedoxasute.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210826/files/20210826140711.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4dbfe29c6---rirejifedage.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kls0jbpgd97d5lp6rbf4cmnof7/pinuwuzepodaduworetumo.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/29638104191.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/25128216946.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/08378588fa7379116491c752b4fdb714/3528335150.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/89899779220.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/22854032611.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607154469698a---gogosexozixuxirelebozobob.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/56636124774.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/62003426388.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf31dd39a1---javulafu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9ccc20f21---kobipakixapugamovamude.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070365cc10ba---bofibovo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baaa753e1ec---rajutesafo.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/kerivokapovo.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/fasurego.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3e835fe7007392270a2ee7337c38d451/fadudesikafagekezofade.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9982005e65efd1ad896afeccb7638d34/32070049079.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/kuzilugokudike.pdfIn PDF document text
    • https://irrisyst.eu/files/file/dimonoziripovosoxulovoj.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/tebal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pancreatitis+guia+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_off0000cd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 16796 bytes
SHA-256: f549b24ee0245d408bc335a56942aa982acf7000fbbf6ed6ffa997968a2ef6bc
font_02_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 10732 bytes
SHA-256: 4d98cd7d3ab476e7b22e9b67d4fdcbc73dad99c25922aab2321f4f098b99d565

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