Malicious PDF — malware analysis report

Static analysis result for SHA-256 063814d50fdeb4d0…

MALICIOUS

PDF

73.3 KB Created: 2021-09-21 20:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07b3b73de42bd70775cf7b3834f80450 SHA-1: c89c4012f5838d4b7be5fec8a7c87d8de09b8b29 SHA-256: 063814d50fdeb4d067e48e2666f7a87d9a87db974eb91735e5edcacd0fa91035
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://inwebjor.ru/uplcv?utm_term=the+common+sense+of+investing+pdf PDF link annotation
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614933a7b4943---61095900024.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/lekejipotazuw.pdfIn PDF document text
    • https://datajournonepal.org/files/suxobozozogerozo.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/puxarizodaresav.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/kugadoliwogawaso.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/voratenidudew.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/70727485198.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/fetewafe.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/lmb90fi5ttp71elodrfgq5jgvr/39720759938.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/mekosivupixezusefuguki.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/5556940396.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/27301872268.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/jimipizupeduradinefovag.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16141dad05b392---korezuxasogebulifikofiji.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/mogobufepolakivitux.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109190003592886.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/xiwoxu.pdfIn PDF document text
    • http://clingac.es/d/files/sevuzovalisopazifilikuruv.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109040226557662.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/desajiketiwifixab.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9a724ef40d7c72b3635193b3022f1901/notopufabamixu.pdfIn PDF document text
    • http://leruichem.com/upload/files/90321461625.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/13061921360.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/162154065282.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62069467944.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/70949662835.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7B 15892 bytes
SHA-256: 5d1098ce2e4676994a3217f447253f21af672d61c84a612af5547eb2513a99ae
font_01_sfnt_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 10788 bytes
SHA-256: 9fc4f3fe9749ad60199f930f8a0e825db3cd84594a67b1e180a521a89573d6e6

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