Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba4db584be3d7c0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 04:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35ced6e37ccdb5a7ee8049f8ea1c9f47 SHA-1: a72aff883dc476c1bf2a01bb3856d97a78da8f6f SHA-256: 8ba4db584be3d7c0c20023ba4daa509d5de740b349f65ba9eb2176dccbf3436c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 5

  • 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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/efd2253b7e089c203b940acbcbbdcc1d/nojaxi.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5756d988---41034139336.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/34475133102.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608502e41a939---76496496929.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/55034573636.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/70684192331.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/potixadobujuniletebomalod.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc86a9c1b---45984300773.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/91178618506.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3fefbdc2b---50908873120.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/zafalirawezugizakuxoregal.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/48112513201.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239bde7e1d---72443846543.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/10937994172.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210821115410_5igccf.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/10332185585.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/bavelujinoxilesolowos.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ac4081e66---87768866833.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f124a44b---92620790063.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/gabin.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4344154fef---fibevazozejosomotamore.pdfIn PDF document text
    • https://grouptm2.com/contents/files/9724110753.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/84735219356.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/kamiguzazejufolipime.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/47014177089.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f248a58300---39974655465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=iot+based+solid+waste+management+system+for+smart+cityPDF 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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 17196 bytes
SHA-256: 094c811a56ad9a69197548258c83a8675ec3a443a3a61941ff82ae038a347ac2
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 11112 bytes
SHA-256: 2a3b62eff8c0efcd000dbedae6c5a24f9dbbd2525cfcb5276cf963e06ec983f4
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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