Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a2304665ef6ffb…

MALICIOUS

PDF

98.5 KB Created: 2021-06-27 09:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 017dbc7d68bfe6fe300e01be3adc1c0b SHA-1: 25400163ea779d3a0fd9ec90a3cb0f88f19f61f5 SHA-256: 53a2304665ef6ffb0ee1d13c1f3f5a2359f4908ca188dbe9aaf64b4596133f49
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute malicious payloads. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/i9hocs115jjc174aqsb54hjefp/nobasavototikekekovuzujog.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3m1sr9h546ubtvkt2qakjtdam2/lumapus.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd069bc1bbe---minifagotovipuxekajefom.pdf
    • http://rszm88.com/upfolder/e/files/20210626105248.pdf
    • http://elateridae.com/images/FCKeditor/file/fipera.pdf
    • http://hainescentreasia.com/images/file/sutodipevomafemop.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fe17961ccd18b91c715bf227530cf872/sesode.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a48785c0---gisegisirogupagemunom.pdf
    • https://loctra.net/userfiles/file/mufobasuzevapubit.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083994490a3d---72559119230.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e1395464---17657386031.pdf
    • https://emprenderem.cl/files/kariguwe.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1572mfmcmpv0k8ofvp7g5rvke1/64412897207.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afdcbb7d331---jeterikugimesi.pdf
    • https://anmimar.com/royal/userfiles/file/mafojupezefejisanosit.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/nitikenokuxu.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df13cdbb7b---gimuganelanigofaliwuf.pdf
    • http://afghansolar.com/userfiles/file/69870473579.pdf
    • http://ufnk.fr/app/webroot/files/file/vapitajibawobikimenid.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ec30281d---43966465036.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=supply+chain+management+strategy+planning+and+operation+sunil+chopra+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_off0001174b.bin
70f97a21439f06c88a8752777f4cf6799201f4cd52a513f96cafe74669163c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 11356 bytes
font_01_sfnt_off000131a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 16792 bytes
font_02_sfnt_off000149b8.bin
1d81303ddd4df61ddc21872d738a420c828b0f8f21f3d83e5eb43a49f35f274e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149B8 19688 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.