Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b45db5cad35680…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 10:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65088c92c385c4a40efeb23b27e049de SHA-1: de0a9ba10152b2ce005bf4fccc8a72430f30aabe SHA-256: 91b45db5cad35680a267906f886c221b1954d8cccb9307e84b2883e3d0a9dfa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://salonorganica.ru/upload/files/soguliwuwakozete.pdf In PDF document text
    • https://dursunguney.com/userfiles/files/nolosuvojizexuvasu.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/zexabinilugajuwifuwifak.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/jirufivasafujujibod.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/39160557130.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/katibiwupon.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/muxibuvibonerisaj.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/65657293527.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/todikupubuf.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/60369332093.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/lararor.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/5445701862.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/kowuborenavewili.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eae533fdc9---4565045282.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/guniwak.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bofudugowu.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/64914978403.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/776150092.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090616180324.pdfIn PDF document text
    • http://www.socfertenviron.org/cmsfile/contentfiles/vozimanokegosadi.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/kasusigematol.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8os5epuhudedk9f96le09agcpd/92450768773.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/464a50780ad9756e8c7836daa747ac4d/suxebimulawasijawolapusiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=advantages+of+polyvinyl+chloridePDF 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_off0000b0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FE 14804 bytes
SHA-256: efe571023914262236d2f1e08bb68743bbbfde50393ea0336e3034fbc6a93b67
font_01_sfnt_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 11060 bytes
SHA-256: f4836c65de798e32394cbef394879a89885e350810c52b24f318428a3f98da6c