Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd139695c437a8f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 04:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d49de5ba73b6d376884a6a6230100f0 SHA-1: d7beef9b353c3200853b323a3a3a1cb7730001ef SHA-256: 5bd139695c437a8fd8a2ae77360444edc718ff988dc18cb579af47181a7cb5eb
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm designed to redirect users. The primary purpose appears to be SEO manipulation or hosting malicious redirects, rather than direct execution of a payload from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=best+android+os+for+pubg PDF link annotation
    • http://namngonviet.vn/user-/files/fevukotizuvotijegusuful.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/pusopoxamefenu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/44379298886.pdfIn PDF document text
    • http://linza-market.ru/upload/files/37799079029.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/83251415769.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/17774798881.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/g8k4pfg47qvjd8odqmvijuablm/kitofanibi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16140266eeb1f4---depegewejolivoba.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/ruvenedekikodedez.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/25741379919.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/60900747222.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d5de86220ddea2b48771c42b34bdef11/retuxudekosadew.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9eb06df7e84ef3c4873e33d30e8e0e7e/sefekapopedemev.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/matopivaxefofiduvurijagut.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/39529716003.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307e8547665---84735049326.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161366f62e02b8---87735788389.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/tugibijanil.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dasizowewomemo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06eeb25c9---fibedisokun.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/37844296795.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/wiwunuzera.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/sosipupezapuwimalur.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/74733960726.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/49672408649.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/ginuxisokodovuzumixe.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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 16868 bytes
SHA-256: 397329e80f7f4ed7e1a75a7a3ceb39ab5305da2014ab435307c760dbe930913b
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 10920 bytes
SHA-256: 145e5fc3025c0733507240ede94a1f30cc81c6abdb4b37d0187dd857b01562b7

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