Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d63f0a8798fae18…

MALICIOUS

PDF

135.3 KB Created: 2021-09-04 19:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c36ff2fad8f46b2e4c81f15c79d81ec1 SHA-1: 101b8a2078a3417c9c70334c5a553bd369c16a9d SHA-256: 3d63f0a8798fae1893a2caf098e1fadfca5c5fc87e9bd6f02e5a0b62e19ad9f0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this as a phishing trojan, and ML classification strongly supports maliciousness. The primary attack pattern involves luring users through a malicious attachment to a network of potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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 https://manuscripthandler.com/userfiles/file/68034277692.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d898259507---41931131492.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/45665826347.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/ponusoxokilexop.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/nabawekosepenukadasarin.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/50660409259.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/jovoxebajarazi.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/85916857590.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/25458217444.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cd68c28794393771aa1308d66c5251a5/17113136740.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/49815388856.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/fdd2c2c460e643d4fc15aedaa63d503d/lojomun.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/39201281611.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/mavipusukamax.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ekscrosn78endvmog46vci6tg5/88095583399.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/cia2v5irvf1jf6odfi12qnkel4/58351527327.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee8c7f9e0---kusezegulim.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be57e7b5f7---legivig.pdfIn PDF document text
    • https://langumeistras.lt/i/File/nezafumud.pdfIn PDF document text
    • https://italvaping.com/file/79870424538.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/31e2ea9be5c18cab6122675fc94ba351/7994517702.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28d3745c4---kumekonaxetetizabuxop.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/3536016975.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b8d355fff---36906488275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=daelim+vs+125+manual+de+tallerPDF 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_off0001ae7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C68D 18520 bytes
SHA-256: 8797c8c0cabe6881edfe65db693bec817c4d5a9d1cde602013ed2ca43272bcb6
font_02_sfnt_off0001f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6DE 10764 bytes
SHA-256: cf83bbd5fe2463b51190505fc8fcc1e01e5f47b905b49362762b59562f836e8c

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