Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c93a1091b2ced8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 02:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3e28a0cfcc622816a74ec0df64d3131 SHA-1: b750606b504734a11fa5bdf4295d7d0065267879 SHA-256: b7c93a1091b2ced8163dac850506e45191895490ce419e410a532a95bb0c5467
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The embedded URLs, while numerous, do not appear to contain executable scripts or VBA, indicating the primary malicious function is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://lescourailleurs.com/upload/editor/file/56462464480.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a41a15212d6---rutimimenujemelet.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f0fa04193---43476190878.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/10136644499.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/womin.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210902055817.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d5778325907---11265492034.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/54785401177.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/tiwilunudetasejarugunezin.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d255f1ca6e---buzafonijepipiwaxilavu.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210619_D4185ED4E44D24F0.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/zulerefowolosiriwofiz.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/64879224738.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3e5d0270d---59005500884.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/24222854475.pdfIn PDF document text
    • http://aven.su/userfiles/file/43912152197.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ntvp7q3hlg1qsgeuoltmuo0svc/mexan.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc78aec88---vogadibezekotagumabev.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nudekekumevududuvo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/mewiwanevebosopupeletima.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609305cc524c5---76250957989.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161197f1092987---gaduniruwerepirisox.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/52940226389.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/53825873820.pdfIn PDF document text
    • http://agrion.org/upload/fichier/pabobewudufopasosaw.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v62nvicjn0fnihttpct37khndf/27079895928.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/lizovir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=inokulasi+jamur+tiram+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 16544 bytes
SHA-256: 5887c712a7a8827c7e74f1c70f93ad997687724958ff9bc50b738d9067a33dd2
font_02_sfnt_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 10800 bytes
SHA-256: 0b6f8417bd0cf7dd587ff15c44c4daa1bd3af02837ea34936ab7d2a9d3215acf

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