Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d2792c102238b3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 21:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1a6c02d8ea6714a77fc65d815fc1968 SHA-1: 325caf01e1a6965f6a0adcd45c4549946524686f SHA-256: 40d2792c102238b3b8c9712170031066bcbf25ba2eb44285103dcda861b51fee
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting it functions as a link farm. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to distribute malware or engage in SEO spam. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=cambridge+english+dictionary+%26+thesaurus+pdf
    • http://7seapharmtech.com/Uploadfiles/files/xopixikakojebunifedofejev.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a7e650219a9eff324a09b69bd5b075c6/68419075038.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d5279f4b---43656875268.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c74b89f29---49360788318.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f976ecdbe93---talep.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/katagapupixogowosa.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/27124154748.pdf
    • https://ncvpte.in/userfiles/file/21858262300.pdf
    • http://trunglam.vn/uploads/userfiles/file/65135780432.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cacee2897e5a38a0e7ca93f75ffc16aa/18026147537.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb488c0ea1---2035652738.pdf
    • https://transport-vehicules.fr/userfiles/file/saxikabolodumidudep.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/bovokowexexujegabo.pdf
    • http://fsoa.cn/userfiles/file/66928953796.pdf
    • http://brandnewgoods.net/userfiles/file/limugosixa.pdf
    • http://tsnpharma.com/upload/files/rivinujeka.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ffdb094b---lokukutadodogedula.pdf
    • http://rustproofingottawa.com/userfiles/file/88899693949.pdf
    • https://fokusmedia.com/images/uploads/96288164756.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160719b49246d4---lofiligu.pdf
    • https://apra.pl/files/file/21982405208.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/xojikubakadakimov.pdf
    • https://afayl.com/userfiles/file/75201701290.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c3.bin
0a2e47b9ecf1af8aaa994f6aeacd02cea432a0a8fe61cfb220c33737dfc18db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 11100 bytes
font_01_sfnt_off0000fc43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 16792 bytes
font_02_sfnt_off00011455.bin
0ae68400b0e66e8d09439c978cc608be8cba4f4415e389d88c4c3f2a9e9e2d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11455 18636 bytes

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