Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c808d21f96072d…

MALICIOUS

PDF

103.6 KB Created: 2021-06-25 12:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4f11d521650d697dc9796335116a18ba SHA-1: ad1144d191f8cbfee12779c42e50596cbb4a9df6 SHA-256: 66c808d21f96072d171a62d5d8eb6d6b08a192af3762e91ccb68aff08a0a58a6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to malicious content, such as phishing pages or malware download sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=who+said+to+whom+bible+quiz+with+answers PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a944669a354---47221322463.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/35c70f83384d0b73a5cea3dc3d93a00d/weripujuzodilad.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608531757310d---51487360641.pdfIn PDF document text
    • http://nfc.soo.jp/file/bexutosagujotufiratudag.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/qs2jstp96htkui21h0oopfotdu/zuxuvuzanegisejepal.pdfIn PDF document text
    • http://cosyromania.com/media/file/73203294166.pdfIn PDF document text
    • http://adveotec.com/img/file/13066724029.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fba5b82104ace9da131ceb1f1ecf08e/41032446848.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/gidizilarisowedu.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/jenatubizotemuluxelexu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11dbda8ac---47490292925.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9c0311975b7a98f2046a8f0527241363/10278604959.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/rk97ehvfkqmplpec7qe6f9ft85/gokewixixipofotupupikipow.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5lc4jsllj8qgt36u80dv1b8s9q/jukifita.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8887d23fb---pilulijowagivuzoboloxenar.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/28780547849.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_off00013097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13097 17388 bytes
SHA-256: 40a69b90e645d9ac17512e03fe7b4bd16ba6bc8f4dbe969066c51dcb8572f44a
font_01_sfnt_off00015e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17670 11040 bytes
SHA-256: b30315911b8631df65e6e0e698eb0229fde1eb78dd2d42f6ea6cee8a2e23111b

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