Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57b6882e85364f2…

MALICIOUS

PDF

94.6 KB Created: 2021-09-17 07:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cb6c556230e6f67c82eac0157e85dbc SHA-1: d940db0f840422d973323169f9b922360788f1ee SHA-256: d57b6882e85364f269f814d462ab3dcbaebdf6c68c6c82fb0763f3cea6445519
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 as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea867d88b---35876664064.pdf In PDF document text
    • https://dakhoathienhoa.net/images/files/55378227694.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/wevurufidisilejuvase.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/wiwasi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905041153295.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5c8053adb8ad90381016b895b597f3cd/62545346912.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d11cb7063b01013e1ae623da81f17674/42914617092.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/repawodoralu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe33c2362---81929050551.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/67118747484.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/roxedufanuwaba.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/76119795365.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/xipojuzotek.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/43063530747.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/73989736356.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/rejesav.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/jutelawukatevokafe.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210902185110.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/14177400989.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/69105327383.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/17164785241.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/desozifemekupojapuso.pdfIn PDF document text
    • http://mlead.net/images/e/file/72227297678.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/bumurideredowavesomek.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/mewezorularasivezadijolu.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/95965800631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+car+game+2021PDF 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_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 17984 bytes
SHA-256: 8bac7cddd296622d7be3d78d74aa9ba898c1566eb5344b61632b6addbf1a0843
font_01_sfnt_off00013c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C73 10560 bytes
SHA-256: b808e82d7187ff06be16203a7f4de633e4e3c7571c2d64d5fcbfe53758799786
font_02_sfnt_off000154c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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