Malicious PDF — malware analysis report

Static analysis result for SHA-256 73eb9cf6a4eb60fe…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 01:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48bf7c4f14877664569c005d0857cf3b SHA-1: 9d964b7a24643f67a48ac99598557232422c074b SHA-256: 73eb9cf6a4eb60fed93d6a860e5750d94a4068691b88e26bc5f082e117e1fa2f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://asesoriagade.com/app/webroot/files/files/bimexosutefew.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a945df23fd8---28143159287.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160763ac953939---nesavusomosefuguvexusiluj.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c23afbda47---wuzinasep.pdf
    • http://isvpro.com/custom/files/85694333976.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1e84203115f4317a931ab0bdf909fe5c/62056358382.pdf
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/damugigimemebarituboxo.pdf
    • http://el-system.jp/uploads/2012/files/lelotadometexolutugitur.pdf
    • https://dailyiat.com/html_upload/file/42992453832.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc55dd64d---90635493589.pdf
    • http://career-id.org/ckfinder/userfiles/files/72103772646.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/0686399a5637b81809c720c9007b8942/xezolipixagiwo.pdf
    • http://breakevenpoint.pl/uploads/editor/file/pilosidakikegekidolikewoj.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee119f192---82724564204.pdf
    • https://autosaloncenter.com/uploads/file/loduxibatiboromofifawub.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74bba69e4e---gulutilofodenotamunirak.pdf
    • http://popnmusic.fr/userfiles/file/9390346394.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d7de2026df4400d6cc49568df3129f6a/99776610895.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vutupepilosodopimidomexaw.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/sk4f6e8qeo07ldcuirqj5j61rq/82916691920.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5568fadd1d---8336738023.pdf
    • https://wspaperbag.com/userfiles/file/lirorunurije.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f8150173---92507696652.pdf
    • http://baugeraeteverleih.de/benutzerdateien/zuputesesumoriwemef.pdf
    • https://acrgroup.nl/userfiles/file/joduwitadukizetux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=components+of+environmental+education+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_off0000cd3e.bin
07f70ce743c4749e079eb7c5b80d5661ced46b3f493f9cdf3bfc72bc58887e2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 10976 bytes
font_01_sfnt_off0000e6c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 16792 bytes
font_02_sfnt_off0000fed7.bin
44bc449764b1335b05ad4c3695daf2f636bf344970c9df21e6a76a2d74308836
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 16408 bytes