Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b1060d8381b370…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 03:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7739e387057174edb7c2c7d6e1693ca0 SHA-1: 55f9de115a59eaea06b8bb1abe09535b3082b941 SHA-256: b8b1060d8381b3706ca3b263a2049b37cb4037988cc88a4953808739eb29740e
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content. The PDF's structure and embedded URLs indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0b9e2abc958d9453b3950d06a0ca62cf/85642279786.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a287ca73d6---puduzuretuzotivirijus.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/topabegazofi.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ba4df1e34aece949a24f704ae96b7a69/12451415291.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/dumiligololotuwolukir.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3bf84015---botekofowazilaxapebe.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/66511898024.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/aj7158pdmvpgm84qmdgobtuhmd/bekosowozuwetev.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/18375866388.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/4193836255.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210615043725_go9hh5.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911d3e8a8d6---vunajanusevikofigope.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f0f6df0d55d179c2f2f7bade15ba7785/soxededuni.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hi4eaav0vphsn2ru6unfhqjscl/zafitolejanevinifima.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269bce81c7---sezanamor.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/gowijovumasudilufewizek.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3a161mrbjm530c211kdl20s2s6/66791730988.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/bf4adr2q2p9dn0hl21gdvs78q1/mebiwuzapagefa.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/1640569534.pdfIn PDF document text
    • https://digireg.nz/upload/kodifasabetapolakubiv.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/1956495129.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/jutofiravezaletotezavolud.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/eoqu1q0fkt3e6m7b1kfeb65hbu/30248022013.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/51775515259.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c582340e6e2---regaxezunoboxivovirudab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=camerette+colombini+catalogo+2019+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_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 11428 bytes
SHA-256: 1609766d38a1e30715f63f7e450ff5d92642118a823c221c3ad5e68b2dde37a8
font_01_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 16916 bytes
SHA-256: 64caa95096b59f5425813143ef695dafef489dd66324308e998850b9e9ef9c53
font_02_sfnt_off0001196f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1