Malicious PDF — malware analysis report

Static analysis result for SHA-256 8533c97ff0fd4ed4…

MALICIOUS

PDF

92.0 KB Created: 2021-09-02 09:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0053e25c06b729379e3abc5e8d4cedd3 SHA-1: 45e43d41b9162d80173722c7ee2ae68b2dd52e79 SHA-256: 8533c97ff0fd4ed4efc8c10e2516cdf169a7e57067ec3bf2d10b99bcb2bd8a5a
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 CMS platforms 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=me+before+you+full+movie+english PDF link annotation
    • https://purefeeling8.com/data/file/nuwatuwutosigapimomuzepo.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3436f0a058c0817b2f40c6ad9ff89d55/39030271722.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/61599201037.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/buxivabonapidozegadu.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/xonozosijopiso.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc8539f88---27414057266.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pebeluwodorubu.pdfIn PDF document text
    • http://tai-group.com/upload/files/20053854372.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/senozejetofor.pdfIn PDF document text
    • http://cga82.com/admin/File/9880695301.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2ed1b710---rujufofirowakupalatirafi.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/rarekutafe.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84e0e9e66d---zarigo.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/zapuzikoxegawojexedeg.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/migopisajorixeruxutu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69e7b4fc2---reniremorit.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_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 17832 bytes
SHA-256: de261ddd06b51b3410c8f15878dc847ff0c33b6b0317fc670e35f0bc058a8780
font_02_sfnt_off00014949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14949 10816 bytes
SHA-256: 2a7375481d7583fb07a8cb598f228668e0358d1e3cea3025628d43e223911498

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