Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8b81a1c7683467…

MALICIOUS

PDF

72.9 KB Created: 2021-10-02 15:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 4d6826ea3574e649c9c2cbcf05a43e6e SHA-1: d951614464dafc31ce820e19a8f228809b23d2e1 SHA-256: 6a8b81a1c7683467e384850a7b8adf2f2a990e80aeb45f395d2f16a449c6385b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=how+do+i+make+green+dye+in+minecraft PDF link annotation
    • https://timminsrenovations.ca/file/KYzOvVS714WPdmbS.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3b3b38a1---jofexamozexolofobogobemug.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/mitetatikoxagole.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/85672677319.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/34817408781.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/40153237200.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/19043032912.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/guvazijifajususonegiba.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/33425565162.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/wifuforafuwijokozun.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/36396558446.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/40bdf293cdb2ebf2cff06851919f344d/nifagutadibiba.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/65242163703.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/71949827864.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/87468099544.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157e47bf32d0---76214535342.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/58246044829.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/povebugedu.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/tarokesumemizopezu.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/kijifabobojakomaxen.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/wizugix.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/gunefelijine.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/25f83c0113bd9d1d8f64c4da3c70db37/fizebuse.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_off0000b706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB706 10888 bytes
SHA-256: 6244eaaa4970f4e79d18e998781465fea33a8612bb62a6bb2af632ab863712cb
font_01_sfnt_off0000d002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 17672 bytes
SHA-256: efa8597593dff105d3152c6551ffbe0a4810018ad234a7d529b6c1d76e8761ad
font_02_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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