Malicious PDF — malware analysis report

Static analysis result for SHA-256 728b66e86a5ed79f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 12:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9fbd554756894c275e3b2881090787b8 SHA-1: b6baa6bea3c7139933cf889bf0e4dd674d73a96d SHA-256: 728b66e86a5ed79fa09f0ee722692aab3732f32bc402e19f6a3eac8d808e2416
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination or to track user interactions, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/nogexujadelolob.pdf In PDF document text
    • https://atl-50.com/files/file/najifaro.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/19708954077.pdfIn PDF document text
    • http://esistore.de/userfiles/file/zokogaterefaxesiwegomuk.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/wuputokam.pdfIn PDF document text
    • https://12shio2.com/contents//files/senuz.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/96429720567.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/1660370397.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2fbd45998---80531303622.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c6d9f2c863ea5fdffac6ceb241ca33b8/torogilemexotakanosaxud.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7d22258e03dd717124ac0171870c1c9a/tomibigirurejaterem.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/dugewemalak.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b3e3d4586d998c91edca9d71071e43fe/61429722812.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160904496bdc43---xejarovodogaloxa.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276ea17a507---bosukupapurekonesox.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe6787bce7---94940686865.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/j92l9pbsbu6tmp7jfjke80u3a7/sumejesazigude.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/12744646367.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82831f3c5e---zoxobobego.pdfIn PDF document text
    • https://baongochoa.com/upload/file/57298996784.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/28128931815.pdfIn PDF document text
    • https://limmaginebistrot.com/file/dovetav.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/eg9mg8qn5fjt4mkr2gbsrt12j3/48129152148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bluesound+node+n100+manualPDF link annotation
    • https://www.newswire.com/news/blues...on-of-the-popular-node-and-powernode-21381806In 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 18748 bytes
SHA-256: 6a152980ebb763e950374c5ca57773e220dff3b5ae44280a47151392aea80f31
font_01_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 10448 bytes
SHA-256: d9df9cece52073ee8fde20f967fa2a2ec604f46cb9104166553d6846e9000800
font_02_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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