Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2ce18ded44ce72…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 13:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 802dd82498ef248da98613be739c6c69 SHA-1: 8d4dcd8f95ed92c885c4167d546bdeb7e5098147 SHA-256: 7b2ce18ded44ce729cc8162d6aa6355fbdcb0296daebb794339adfa26a6a0b7f
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URIs and link farms. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=br+code+scanner+online
    • http://wefocusdesign.com/upload/files/59996626286.pdf
    • https://publicbridge.pl/userfiles/file/kesuxogib.pdf
    • http://massimosusto.eu/userfiles/files/36764689474.pdf
    • https://efsanepin.com/calisma2/files/uploads/sawimoxirapomezipoxuled.pdf
    • http://eortak.com/img/fck_temp/file/fusavebegaxusalirano.pdf
    • https://riwg.in/userfiles/file/pekogimuzinesa.pdf
    • http://thecargonepal.com/userfiles/file/kowilomagipomamisexun.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/posiletejamilenagive.pdf
    • http://aostavet.it/userfiles/files/32346976734.pdf
    • http://speaklifeiamgreatness.com/files/files/17950708303.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133dec0120eb---33106197488.pdf
    • https://pasarantogel2.com/contents/files/fobojuv.pdf
    • https://penmypoem.com/new/admin/uploadfiles/file/68978111377.pdf
    • http://www.kymkarajok.net/tiedostot/files/vixuxevizuje.pdf
    • http://leeclinic.kr/userData/board/file/benamotaki.pdf
    • http://bernendorf.ru/userfiles/file/91352004820.pdf
    • http://marthomaiticherukole.com/userfiles/file/wukakijuwurufuk.pdf
    • http://heorungminhphat.com/luutru/files/10445050604.pdf
    • http://viettelhaiphong.me/data/dulieu/files/14361304035.pdf
    • http://kiavysocina.cz/UserFiles/File/laxaxelomigexetiki.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60e426343---13888826570.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/79150100129.pdf
    • http://harekatmemuru.com/images/Media/files/71078638636.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161491f2c215cd---giburixepiwasotuvuwuju.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_off0000b58f.bin
ea8b8551e9d143bfbab3bbd78d8d684bfa9067cde0e55b7745b3c8b948effee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 17112 bytes
font_01_sfnt_off0000e10a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 16792 bytes
font_02_sfnt_off0000f921.bin
688de8e5f86895f02604d75ce2ac3441fdb8b12fee765d35a1dbf9ccd8bf6958		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 10316 bytes

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