Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e72af6273b3c57…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 15:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5f46c11587a29a758917138c65ff1a0 SHA-1: 3fb5b2a41766909903e77aa0958748ea90a64161 SHA-256: 91e72af6273b3c57439b63f7c7227b25c6ca3108a721d18f4b3768bda23da090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of external URIs and the nature of the links indicate an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://planet-for-events.de/userfiles/file/buzixomavepajuzoda.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f701907dfe---64314665995.pdf
    • http://sumterhigh89.com/clients/863574/File/dokopumokizelidigezazori.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80edcef87---pifazibaxebobozu.pdf
    • http://demkapi.com/resimler/files/lubobevo.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e50c551e0---63408668550.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a594b715a53---57288274111.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7803171be6491a9703956d3aaf130780/mavakiwopa.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b137eb5f333ca094f8087261bc8bbac7/rodibiliduxurumudaro.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7pn3q9ejcmbdjmvsnghrhafki5/birifujix.pdf
    • http://ampletrekking.com/userfiles/file/92808084093.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee92b7207---foxosijufan.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28698327a2---vofavipe.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c9ebb373bbc10d74f2b590d49dc2c3d1/93558784254.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7747e74625f8f66c5ce2baf10a947490/simoxovivizisepope.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5d64b6e173a3d2ef20db45e3e1679353/93485419341.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e653d540a7850d806e8bad0880df519e/51692029256.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078764ce3aeb---53008783775.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7e7e5460c038f91bac36601b19562dad/82052895294.pdf
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/30641101092.pdf
    • http://mail-ex.net/userfiles/file/49212725302.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=scrophulariaceae+plant+list
    • http://e1pl2.nazwa.pl/busy/fotki/file/gizexuwibutak.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d620.bin
2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 16204 bytes
font_01_sfnt_off0000ebce.bin
5a6f28d4a9f33867c63d461ff62b1e2cee256175bcadeef29b70ea89b0495d46
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 18412 bytes
font_02_sfnt_off00011a4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16792 bytes
font_03_sfnt_off00013261.bin
5c593a41075c8218d0dcb41d62ab1dacf5e0bff0cb199599463f8b1405fcc125
pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 10648 bytes