Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa74ce5a71557292…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 15:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c244d3db9cfae38e2f0e037fe86aa598 SHA-1: 574fa35f4e6ef5292e66dd1a7b8d45b7306b2511 SHA-256: aa74ce5a7155729290f290611a84838f4773ed1be80e9b01e18e0ad025636194
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous compromised WordPress sites, many of which host other PDF files. This structure is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious verdict, suggesting the file is part of a larger malicious operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbf8dd9031---razibipe.pdf In PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e7ae4cc96---wivojesibo.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/39432349761.pdfIn PDF document text
    • https://synersys.fr/contenu/file/wapukoruved.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tdb7bhjuck73vnh986q24ggtdh/zojuzofukafa.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ev7k71b8fr74pbpo9jemsmj5h1/40198624170.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d9c0da7701686009a27ce3d81507f3ea/45543456993.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1b676c98---14098277625.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mh5fdeeum4lpl639depc87jvgm/wagafudimobomewiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988b6e32123---85206454550.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c660e88398e---matusunekidati.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/o3sh27facak0bfoaq0528u15i5/dovenegesuxadumufekopedag.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609307b30a8a6---lawolafuwelepunewu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c58dbbd649f---60393875368.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608766c9e7a54---80970775776.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/7498998253.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a484e429c9e---pewun.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5790f584bc---67586631226.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f2b53d16---fekupitasuzojoj.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607196dd7e0ed---nifok.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b673e98c305---bimajititolitigaviteli.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a28190876c2---zegefigabagirarowigi.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/a73cfa5f50a5b555a2f97d9be981dfd5/lidobivapejimo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cdcda4dd777bf37ac0c46af13dd30070/ruxabasodomivitobofabijiv.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/rotadiji.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c994530e63---vomonuzijagenijeputeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=less+than+thrilledPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 18184 bytes
SHA-256: 528c268706c0ce0ce5df2062bcea48048757298b734c4bc0f02b63c2428c2667
font_01_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 7396 bytes
SHA-256: dc70a422942ca3a97b5dc6b6f2f6457507f9ad652f3859e2862a9bd8fe3f7869
font_02_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 10180 bytes
SHA-256: 6c32d7e44465b43b85553855b35c865c5a329ca99de09e4c1c3e3d271fe4346f
font_03_sfnt_off0001338b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1