Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b84e1a0b2c1fb5…

MALICIOUS

PDF

94.2 KB Created: 2021-09-07 19:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a51d4f893b07d73b65c335b3bbe292b3 SHA-1: 6d29aecc54faa5d694b0a4cb80c0c2275e7c524b SHA-256: 25b84e1a0b2c1fb5d66182ec4f211e1496626688175da407dfd4273483ec8aad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the links and the PDF structure implies it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1188f55b---somop.pdf In PDF document text
    • http://babywagen24.de/userfiles/file/28719253414.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/89216389748.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/99269211023.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/bomogirusuzanaga.pdfIn PDF document text
    • https://produse-zilan.ro/files/tuvadupudasema.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0d749891---16824883638.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/meledemidorere.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/lakewoxukorobefidit.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202108292321181018.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/537db9dd6b0585b352921f00190d3aaf/64077121737.pdfIn PDF document text
    • http://keitbg.com/images/files/gewuz.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/jinajikosadu.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/35548304655.pdfIn PDF document text
    • https://webmenuplus.com/images/file/jifawifopogi.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210816212011_ib0k03.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111bdbe419a8---gifatituvuvotofowazed.pdfIn PDF document text
    • https://cakkue.com/contents/files/sawuvurifovofasadeluzi.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/81225593407.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/wijurutogibuwofidut.pdfIn PDF document text
    • https://appfacile.it/file/14140648274.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e333485e022---62407759570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=seventh+day+adventist+church+heritage+manualPDF 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_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 11052 bytes
SHA-256: 04e8147ac812bd90e8094d9bedefbb07e2f629b590dadbf1c54ef5b058b1ac56
font_01_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 20720 bytes
SHA-256: 4ae66ff9d2ebea2db4172db45ee5fb62ce47067ed7d48fa349dfd9727d78e3c6
font_02_sfnt_off000152a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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