Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c57e771da2436c…

MALICIOUS

PDF

71.4 KB Created: 2021-09-06 13:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61eb2f4cb977db9cc923b6d368b0279c SHA-1: a8435c789451f71231f2b5fb522d557fe2898444 SHA-256: b4c57e771da2436ca224f526a14d08cafb144aa2f98a834d2bfc04fadf2cf262
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains a link farm directing to numerous external URLs, several of which are hosted on compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of these links and the overall structure strongly indicate a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yuanfuconstruction.com/ckfinder/upload/files/momimuzalibovagosezizeni.pdf In PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/xasak.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/zaritotibezu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160795a4673150---10880147637.pdfIn PDF document text
    • http://tulga.ru/editor/files/zoxepoxu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bef9d02a---14597787671.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/33140685c8fadc2032cc665b242dde2c/22350797712.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060116591153.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/48959608495.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kipefutadedu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee1fdde20138c27c5d0e3a5080fcc209/38120245660.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c97030ce784---nokadu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386b9d20fb---fedufobidiwede.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8sbb5s1p2f8ikc13dqat13g06a/sodiletodod.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nodetaz.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/3118851691.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/21679674641.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/3775509341.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/42158051311.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/24337672736.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/jutuzepapow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cancer+broncogenico+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_off0000b963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 15440 bytes
SHA-256: 26d691976356137675f691b4a2e4cbd8d9d79eb1f56697a83ccab38abfedd0ca
font_01_sfnt_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 10652 bytes
SHA-256: 4131933a83621cf1b48709626fd56e38477ef7872903cd4ad1b906e6de53c6ab
font_02_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.