Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a4d8ba064c09a8…

MALICIOUS

PDF

99.9 KB Created: 2021-07-26 00:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 191fb57362dce86b08e4ec8f26f00cdc SHA-1: 33e08fb02faa5393e7001016ed0cc1e82f0b41e8 SHA-256: e6a4d8ba064c09a81ebb2fd7ec6d18f66410f1831962ddebe74fe41dec1e1326
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085119e1c6e6---pojipufurexufibuzepitib.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b8adac6834aa2cb0f3e3f74a4c155ed9/nuwirakozid.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210523/file/62148390168.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0c3a524a5---tabonuwowokiwofefepo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777cb2f373---66634054876.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/zagokajimurofeb.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7698e0c3c---boxiwugen.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/guwugovogize.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/tedepivavozo.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809afda82a3---99713019373.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/watodopajubijek.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe72be9e62---xosujolupup.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607277f102462---razutewala.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/eb67f83beafa8563d33807bce3d27bac/fofono.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b66ff857c9---sopipikawoje.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55197071e1---mazifunufezedun.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b7c3970e352edc8738098fb0e5fe9a54/somemapafedovamumeze.pdfIn PDF document text
    • http://biosite.ru/images/news/file/lomavesezixowinikizi.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/zorezojusutoxuwogufewijij.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/95187915689.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c423fb4cc3169154d9ff6ba6e7f31b33/95775530971.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6b7db51e1---padavinasuzinonenem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=does+bape+run+small+or+bigPDF 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_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 18912 bytes
SHA-256: 05f4e1320f099e7a1ebc205776656284b0772633c85bd148283f2b0c1bf9497e
font_01_sfnt_off00015175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001698c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1698C 10740 bytes
SHA-256: 9992165e2b5a988557daa3f856ad6a3c843b47b8bca8350e05bcec9040c26e01

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