Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3647a90cb262e48…

MALICIOUS

PDF

87.8 KB Created: 2021-09-12 06:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61d36d1c2e183da1b1782154afaaf8fe SHA-1: 884485fdaa36c6e84c57ae18a2e4f64a696f00df SHA-256: c3647a90cb262e48fdae258ad95fc2efab6bd0350db4bd558439cbbf7f722444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://nomylo.ru/uplcv?utm_term=batman+arkham+city+apk+android PDF link annotation
    • https://euronuts2009.ge/files/files/9941786295.pdfIn PDF document text
    • http://santeh.md/img/files/tokirogagenajibu.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/90723744272.pdfIn PDF document text
    • https://signika.pl/Upload/file/vedovumotugu.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/39104367507.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/kamugenunimebalavunuke.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca470912d---6074984509.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/120933236168.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/37910042696.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/gozozuji.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/jejosuvaparedifalaribulol.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/92b4fea20896df6a8948ef4bf8e4ede6/43918509546.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/560911594.pdfIn PDF document text
    • http://gtshotel.it/images/file/nifiridibujexenedakud.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/69854833151.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/83212711143.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/vewafu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/diresujogi.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/17888089862.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/tevufavovovuxif.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/96711647718.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/65b9dd2ae573182a7c3886979c57e283/wofekuboxugeva.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/68089465335.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/93769662051.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 18128 bytes
SHA-256: 3f2ce268f0ce7f82b86ec3c1968be383c72b37f9c0f24c16043e049c6e53fd59
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 17592 bytes
SHA-256: c300d3203d10fad08f196f7bed3bd43aea73460dfbb8820736817db3b6178f79
font_03_sfnt_off000138c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C5 10692 bytes
SHA-256: d4e09c4d8fd4ffc7996e7b6399c6d9fa9e9ab1e60aea6c06958b7fbba4cdee2d

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