Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f897c0474aa1bc4…

MALICIOUS

PDF

86.8 KB Created: 2021-09-08 11:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 41ba87e8676c311b5163b2e6eccf6b91 SHA-1: acb27ba5826a76dac8b309ae4a413dccee73cf87 SHA-256: 9f897c0474aa1bc4adcdd96be0bdb8a33933d453cacc03b47e20dc16c52c7176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff43e4d4e---83018637860.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161059a032d3ac---15361269487.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1a0acd5b---25255981958.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/34264836688.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ba352657a0ec4dc0b3ec0ac5441b45ee/milewoxok.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ccb015c7b---rozoxosakalobovisala.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5f830267a61a1d5cc51d950026ef8e8a/xavagemosoti.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ee8a1f4b1b9f84bd91e20fec5652e7fb/wenesarekuwixomis.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/wibudasakovurijesofa.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609719f2b3ef0---vitade.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0e308f12a---98169085313.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/vowewevajilav.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/javapavupujiju.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/savuvigofosimutafupagofux.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/misejimawalup.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/xeronobetegulor.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/jojebujavo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/694065451b00004756b79bed4964e103/21039213450.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/gepamuturawak.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210714_9B9684829923A40D.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607690aabac20---60533477474.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/bedepalowusorine.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/mejigunufeke.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/47772375327.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d5457f0df9662e40e92166cc091bea9e/83115029701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=twelve+tables+of+roman+law+worksheetPDF 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_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 10736 bytes
SHA-256: 1c5b147ea02eaab055f2802dd2f38ebcb780b1191ac6180c0eb2c665dc29085e
font_01_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 18108 bytes
SHA-256: dca5a179ecc20e8e2faf67af031f13721857408118f89701fbfb9c50e3025f94
font_02_sfnt_off0001358d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1