Malicious PDF — malware analysis report

Static analysis result for SHA-256 a085a19d357a9b99…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 14:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30c738bb321e69a47a7c2feab6e5e41d SHA-1: 47cc36500248e1e42e93013b02cb7c22c799be80 SHA-256: a085a19d357a9b99c941f73dfa5c4c844fad35fcf20f82f7e340c8339069f0f8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the 'SE_QR_LURE' heuristic indicate a strong intent to trick users into visiting external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8d586e004ff76277f5b602a0c254875b/rutokaropazogojalemukulaj.pdf In PDF document text
    • http://insei.eu/userfiles/files/23956834073.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/84016163727.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/wefopepapujado.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614026b348ca6---didajutamodo.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/93268200091.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/6421472313.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/mosugesarowoxeworipizoxox.pdfIn PDF document text
    • https://securitydm.com/slicice/file/17266892823.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/difupimobekavalerus.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/84737972830.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613984fbb76e3---60391616343.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/35586650390.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/luzazunatafasisul.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/49270781101.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/71038826624.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/petewijejugotiluriw.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161408786c2449---83705618443.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9a9a3c4fb---56342634993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=xiaomi+redmi+note+9s+tips+and+tricksPDF 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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 10896 bytes
SHA-256: f83603045fc02e55abe4d37f1776d46292455e5f4c0f336b50b5ef2cf83bbd56
font_01_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 17804 bytes
SHA-256: 5f3d0b0ec401635b410c96b0bd7a0a387133c71e0435ac19b13ae323f055e223
font_02_sfnt_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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