Malicious PDF — malware analysis report

Static analysis result for SHA-256 cead994b5143b7b4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 22:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 265195b19213642117085af97864d3c6 SHA-1: bcf5c02c1d72412dafaf816628c8147399296c91 SHA-256: cead994b5143b7b406c3d2af47d5d0b6fcbb32531d5f6e3642d25f3784aee728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple compromised WordPress upload locations and other suspicious URLs, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=list+of+playboy+centerfolds PDF link annotation
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b96857335f---10185703520.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/41765725035.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b570f55b0e05e092401f59574f058edf/xukufesam.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/im7dg9vh7d3e1gcmgsls986l5o/22344737455.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bc1b707db---36194203628.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3afe5109e---xawasesogusawaponunowi.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/ruvalapujuzugi.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/kiwenafofezetapikigoralo.pdfIn PDF document text
    • http://didopack.com/files/76871403248.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/jakisifofelowulupep.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/1335hrosrmt2is20dpsjetrta3/32694404418.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/79980951223.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c6d40ec055897d48b92dc33a7a299384/vitoxaxuxesefizasema.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8674b626---22167610037.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02e1b61221---kiretivegegubexamoworur.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/xitomoparaxote.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40334b50a5---nubanobu.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/77999676903.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/poxukexujejax.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/68657241499.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/40492364175.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c39c8fa57f0---vudoripujepivusegobak.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3bf3e5d1e52e50b26f67f2b907234ec2/kajenofu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/rivufulijodoxeji.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_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 17336 bytes
SHA-256: 251c83e62ed47c3d0bd93435f2939efda38898e88e3bec8da94ff39a08d390fb
font_02_sfnt_off000129ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CA 10824 bytes
SHA-256: 67ee64015f52431c8f8c6ef7a3f0cb02420ab2c28b64353584a42a13f72db220