Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a4e2efbd98b480…

MALICIOUS

PDF

89.4 KB Created: 2021-06-25 22:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 095987f3a7a132ad706a0c3940687601 SHA-1: 9c2a49c4dad8b6d98f5d03e1b7bbcee474a0d4e6 SHA-256: f2a4e2efbd98b48077288228fdbea1b7d6e5537f912a8f0f6aa3fa547c11075a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This suggests the primary function of this document is to act as a link farm, potentially leading users to download further malicious content or exploit kits. The ML classifier strongly indicated maliciousness, supporting the link farm and potential exploitation pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2539df726cf635e09339b22d61e3dc59/vitigezurokusilenine.pdf In PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/zuvesibunosukuxunakibosof.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a397ff8209b---28219505825.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086adcc26126---27747415518.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/15112649904.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/18089228338.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac778eccc---15751196365.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/62286109041.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f528bcde3e---27833963337.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/45899074686.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/fd2494c58bb9bc2c5c5f3f7a3f5c9b4e/jalafajudupanilawerapu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/21116818448.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/52438342526.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9014fad0f5bdd4f714dfea7bebb0043a/fetezuxidunumuxopu.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/pakanagonekotitaz.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0415ab3f2---73803027742.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ec50e4df742fdf0130c234bcec62491a/52097511820.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d16fd030eb622703f51426e75875c674/64373523780.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a82515bf76e---fudegepuxin.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/s8eqk066e5upnieq6uqsiadtns/xunigalekujusurofotejiz.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/54724834004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=classification+of+nouns+in+englishPDF 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_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 17472 bytes
SHA-256: 36f5bf39b6d22b0542f1fde2e6ebfd5cde9bb5a5306d39b66e6cde36374f1c10
font_02_sfnt_off00013fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD6 10648 bytes
SHA-256: 02e1b50cb3fc51fbee578e14630f2330d619b55560715faba4983d3927b25d40

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