Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf2dea5e10d7c61…

MALICIOUS

PDF

84.5 KB Created: 2021-06-27 00:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64df9b106e531974190319e997ac5420 SHA-1: ca36ba3facf5b5f5c2fd58de2af882cd40824a27 SHA-256: 4bf2dea5e10d7c616d2bc0a8721419bb96d2279b9207f28677a588b84f62f4b1
176 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple links to potentially compromised CMS upload directories further supports the attack pattern of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0gnq0f0607t63phha58ekv7gk0/31757281734.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/9b3i03tlhdbsmg217gu3gjljk7/vekofazugorujovona.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826efc879a4---89865555396.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf678c738---88874544863.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23655388561.pdf
    • http://turnyras.lt/Files/file/97698488224.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728cd26fe3f---93510902357.pdf
    • https://zold-kommando.hu/files/64013700635.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/6300441772.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a097f0c272a---jidimalodolu.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d69081d8f---71765941494.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/rurari.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502032532238908.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4f3b4d4cc9878172db04a1031bcad746/52482875616.pdf
    • https://mavibusiness.it/file/33948855229.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/4ba9e3091bbcf49537a616ef410b5853/turisumez.pdf
    • https://alatheir.com/atheirwsfiles/file/nejugogokemuzak.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/baxixagekubavare.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c055d4506a5---96458067069.pdf
    • https://hogies.com/includes/template/uploads/file/47586938155.pdf
    • https://baongochoa.com/upload/file/rewenulakuluzoked.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8cc3b73351036252e82ed47c96bb0a06/95749587097.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843cf97ce61---resixoraki.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/593d66c8118656d51938ad4e649ef873/goxaxujel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pinal+county+website
    • 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_off0000e64b.bin
f451ad3db33ab85093c48337174eed7b81a68a61b3941cd4aba14f0540402195
pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 17588 bytes
font_01_sfnt_off000114c1.bin
77ce55a396a8728e84b41838ba28aa2e72d2ea6c03699ae8218d64ca54495f4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 10564 bytes
font_02_sfnt_off00012d14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 16792 bytes