Malicious PDF — malware analysis report

Static analysis result for SHA-256 2301f3e1f1c9a056…

MALICIOUS

PDF

151.5 KB Created: 2021-06-26 16:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 53ae4dee017dda1b7353373e1882d161 SHA-1: e046d2b8a911ab7770359c66a975a98c0752fa61 SHA-256: 2301f3e1f1c9a056a5064a303cbd008a042b62a545fac0cd5d30bd1835385471
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack vector appears to be users clicking on these links, leading them to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3cvkh06kq0641kjcb55oduhi48/59586561768.pdf In PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607006fc1c91f---65542690466.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/vkv1vtg6sprtmn5102qrq5tovq/refagoxelije.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e51dd78f50d00f03c6500be7a605514c/fiziba.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e6bc911ae6445e52a85a85b68518ab79/59205757738.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e54e8058---jokigilar.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7c4b5ecb---porupuwuwusabi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d243c98c---petuwod.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4943f104cb---tasiwiz.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/53185715125.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5d2da3bc3---niwomolifojujapezu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ej7rvqdg1kd9mdvge0tg40emtj/62297084367.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/bulasuzemizamen.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/kkh2tcv0uve0m6lbnf453tnvmb/50188688586.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b927c4a028---88922154733.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a8f2c80b01f395cedfeff597107d27b2/pufovokegumujave.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986b2b4d467---60920214878.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/dou1efk6sps11ltj6jtmhemdv8/60883577562.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/dd5ea5db8578e7d4482441838ddd9543/xiruziduburusajaworib.pdfIn PDF document text
    • https://paulins.se/anvandarbilder/178/files/bepidilikekeduwi.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/venodepofofopigax.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af865588d87---tapaful.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c0ba1eb8---gujonudazomerexobeb.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/da181d3ac88e2cdd93a72ee7062910eb/7071517445.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a0b2f3b3---59141089371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chronicles+of+enochPDF 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_off0001f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F483 10204 bytes
SHA-256: 263a044cdf8db1fd86f4a7ab703350b832482ebb67a864d8e915589d35df0796
font_01_sfnt_off00020b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B46 17204 bytes
SHA-256: fa5bfba97924ed85f9be2eea490e9d623f57911035b329d298b85db808ac4c76
font_02_sfnt_off0002383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2383A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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