Malicious PDF — malware analysis report

Static analysis result for SHA-256 84317d8a7cd8f335…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 00:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d50db611a7029536c43a4ffdc5a28a39 SHA-1: 06c7bf6724e57f71b9b289d5273f685644700f02 SHA-256: 84317d8a7cd8f335e8096b24a4675277aa93f92ea1b17d68abd156e4eeaba728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=harry+potter+song+parody PDF link annotation
    • https://agape4u.org/userfiles/file/vabimotetuwoni.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161102a2c11d0c---35665975332.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/1005256307.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/418f81ec9e90948d38b5c1fb5c7244b6/basisisadora.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2144ef1ff73b1c616f6b153e33466ff1/gawabezerowove.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/1uvl67e76liph50b49j5b555h1/lezibubofaxadoso.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/30795867514.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/modezepez.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/moduf.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/6003683512.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5bb3706e---820680336.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4c5459d87d9726484e524636a42b4b7e/52709354026.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/biwagex.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/99161494294.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59013e8957---87661352954.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eac61e8ca---81519147150.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/e50aid4na97j7lvuliem5qepvp/nolapu.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/1298707110.pdfIn PDF document text
    • https://stopserv.ru/files/file/43337694124.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7c149bfe674fcb6551b7301104133e6/mojotog.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/89721808508.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/77671355641.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/vuxujenibuk.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa5c95f349---32991332910.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_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 10536 bytes
SHA-256: 9d8dac87cacc6437ca979b76a1e48d93972780ed59600f655a9a9c8270c5e335
font_02_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 18720 bytes
SHA-256: 9580f015c0c5f66a4c68b2911459ccf9dfa1798ab1d2e818b959ddbdba0ebaf5

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