Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41cfa252f8b65f3…

MALICIOUS

PDF

78.0 KB Created: 2021-08-21 08:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7870dbcb9fd1dabefccb84d402cba9af SHA-1: f98b31ae02548452eee76374d1e832e7d00cf9de SHA-256: f41cfa252f8b65f3d32f3951b8c057a17dfed610e2d4df8bb4c6dd6d59803cd0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ratchadatitan.com/UserFiles/File/51100731008.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/33aa32bcac61b2f709e45b238b2e12ea/sununujuxefexa.pdf
    • http://jjmcp.jp/userfiles/Image/file/66765955684.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/37161619165.pdf
    • http://hzdsbg.com/uploadfile/1624013814.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106bfbe0982b---45924472167.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/su59mbdqajibmnj85lq22bde71/vukubu.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d3caa892ec004333bc8c45424d2c1bda/kiwukebixeweso.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/nitaxu.pdf
    • https://grupahatak.pl/admin/_fck_files/file/mexejolu.pdf
    • http://rogo-rotterdam.nl/files/riliwajoxanev.pdf
    • https://amrapalispot.com/userfiles/file/11917888379.pdf
    • https://red-adlay.com/upload/files/28935419073.pdf
    • http://dooroc.com/tk/upload/file/wigesebija.pdf
    • http://whuntex.ru/userfiles/file/fukibogawinuz.pdf
    • https://martensmgt.com/business_school/uploads/file/terapijazusotasuji.pdf
    • http://ongnuocdenhat.com/upload/files/notidiwusebafij.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ca6b1578---wopakowima.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93676776fd---54610415789.pdf
    • http://dakhoanhanai.com/images/files/zizerumujubizawemi.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665a09bc3b---varaz.pdf
    • https://acryl-bg.com/userfiles/file/5838759712.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+replace+ignition+switch+when+key+won%27t+turn
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce9e.bin
7271eba8a54ec8bc2c53aee2d41bc4503311238798c804b39144606adb419621
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 16204 bytes
font_01_sfnt_off0000f876.bin
1c76d67b4ac1d57e3829d0bce166f9743c3543065bf3f4e1b62ba801b8474755
pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 11068 bytes
font_02_sfnt_off00011248.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 16792 bytes