Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3ef4c73f77e99b…

MALICIOUS

PDF

86.2 KB Created: 2021-09-24 00:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d42684c59d13c6380c57d87953bcda7 SHA-1: a31215a47e5a16cbb4953ce5a6d9fe7aa2bf681b SHA-256: 9e3ef4c73f77e99be97a80974f53cdc94b608f70cd59fd5729f9f1dfc262a268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=amino+apps+apk PDF link annotation
    • http://ilkemymm.com/image/files/gapifemuvidafovebagi.pdfIn PDF document text
    • http://bastola.org/userfiles/file/96342312968.pdfIn PDF document text
    • http://wdnederland.nl/file/gufinapavepezudiwa.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131bad6b53c4---jipuzisipo.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/92749084578.pdfIn PDF document text
    • https://irantruck.ir/data/file/94298438934.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/44253915315.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/pamogupipotitowoninijuv.pdfIn PDF document text
    • http://olympusflights.com/files/files/jifufezagavevazipej.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/9884773150.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/13552640357.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/gufesowufolanemiwobokigo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c6edc6b98---54535294288.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/guwetavulep.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/194767197161371656ecb5f.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/lubebolubiwuvuvokuvabopaj.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/nopimajume.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/sunatibilimufo.pdfIn PDF document text
    • http://micruts.org/userfiles/file/dasikenipekubugidose.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/botepuvidosasofibivo.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/ranitorimalegitije.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zififanebona.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb9f32b7c---wevojivo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/f5bpvmqv6gcgfq1ib772g3qvv0/berozafubomu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbe8ac091b---walip.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 10108 bytes
SHA-256: 84c51230bf164ad0ab9c98258cc94fd5f9f1c9b01cd825393f595297ae5e993b
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 18384 bytes
SHA-256: b51eb641b461862a2b83f183e265adbcfe8ccfff6d859ebc51816b7337956b82
font_02_sfnt_off0001331c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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