Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6757aab4109059…

MALICIOUS

PDF

91.6 KB Created: 2021-07-01 13:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dcd80702a5704dd8958c5e0b4ae0f31 SHA-1: 911608799ce99a529cad6279979f30293dfca9d0 SHA-256: 4d6757aab410905955d958804a541de4cb6be62db7e38cd1999227dce4c10507
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090457b8e17e---busigolumima.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6f9390ae8c28e499b1071d522fff77ff/95856139359.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/1174720391.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412edb5396---nutizusur.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078115ac97db---wawumubik.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b07becf479b3606801a4fcc7521aafb0/fuwafotedadawigidene.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1919eabd---bupoxitetok.pdf
    • https://paklya.su/design/img/upload/file/kibabawub.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3106faa27ed3f6fb5dbe2a341f581b1c/69376555111.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f70e88bfd---pogaju.pdf
    • https://dacinsara.ro/fckfiles/file/64086554482.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69981c368---fatiwojajajima.pdf
    • http://abwplazaview.com/uploads/files/41356560125.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7fa45b402ab7b87ae76d425943b2ec64/503372243.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/416a41a8e06b549a300c5bf220481def/xejobenadiwipumanari.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca26ee373f---37790166438.pdf
    • http://hydrem.ru/images/file/kawodikipakemabu.pdf
    • http://lasfyy.com/uploadfile/file/20210610150916423.pdf
    • http://aceonlinementors.com/userfiles/file/kafobab.pdf
    • http://stark-tools.ru/images/uploaded/60257588102.pdf
    • http://rocb-ap.org/file_media/file_image/file/30795081919.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/89605592281.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e64c7b133---60702031091.pdf
    • https://hometeamcorp.com/images/usr/gamataseg.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f09f35dc8---zelesimewotevi.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98777266462.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dual+clutch+automated+manual
    • 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_off0001020a.bin
d75d7aef0920ae3322368266b3727cf53de0f9a13ff57acecb17d1711749c842
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 10376 bytes
font_01_sfnt_off00011956.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11956 16792 bytes
font_02_sfnt_off00013168.bin
3f34b9f135503a8a2ee9af2c369d7b44f30b68e43a435642d4913a08133669f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 18452 bytes