Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c531f30c8f404a4…

MALICIOUS

PDF

86.6 KB Created: 2021-08-23 18:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cf39c84e5ef6e92711e1a594829cf8c SHA-1: 32df50c9a55999a02adf424d37b1faba29978441 SHA-256: 5c531f30c8f404a4c180f3f973b04958293f969dea9cacf5c344dd28a01a3c9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external PDF files, many hosted on disposable or potentially compromised domains. The presence of external URI heuristics and link farm indicators suggests a malicious intent to redirect users, possibly for phishing or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wrd13.com/force/file/11249107928.pdf In PDF document text
    • http://lungshingcentre.com/userfiles/1996351225.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/bijobudewarijomuzado.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/vixuwewas.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/64760778540.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/25016265398.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/votagujos.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/05794a65d6fadb5bbd3e112c4e6f85a7/61602599250.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/perodefofafuwepanolonug.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/35611854713.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/92959715350.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/ef6fa763c2f43e7020a060157acbe040/44899088852.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/rebenuruguzojetodubu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b876c60224f---vokokolupipefifodo.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/togirufunulaxekuga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2742b836---3506884966.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/vagolugaxudavopele.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d41ddd8d3---pobogu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1905b27ed---puwolokamurijiwub.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/lagiruvar.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/xabutufukuvatipuril.pdfIn PDF document text
    • http://findusafranchise.com/files/files/20209764886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+gcf+of+4+and+10PDF 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_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 17804 bytes
SHA-256: e1b0dbe76e32a8c1e91d55b88a1260a9723cafb3dfcac53a02afbba41b0ef43c
font_02_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 10856 bytes
SHA-256: 49dc915ebbbba76180d33b45895c14030fa8dce261890779d8bec2b221d11f83

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