Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c8bb834318aeb3…

MALICIOUS

PDF

79.3 KB Created: 2021-08-27 16:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b97c1426325e9ce1660b1121e9363fe8 SHA-1: 259aa8f1288e42ea410427ae8a98172ca8d61dc3 SHA-256: 84c8bb834318aeb36d9e5cb57623d7ff5113971cd9bb72b97d7d1e21fdf808b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aeronautike.com/userfiles/file/28660654644.pdf In PDF document text
    • https://cmoretv.com/userfiles/32140605210.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c065261feba---38430585787.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/51385075831.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909e252d396---13256414447.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/20181865837.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qj73149ebhnm6m7q9do48lihi7/luvedusazexutozamari.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/sinepavurojerubupejunug.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2081fb68d0---bijiturumipamelilukonuli.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/sewifixuxosuxolusabodu.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/nidokuwutaperu.pdfIn PDF document text
    • https://adikkedua.com/contents//files/64050827642.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/numad.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/55782332834.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210619203843.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/6a157e8c3cb7a528909ed7698a743529/19331932089.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/lemetake.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/xemabokesiwive.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/09ecf162b511bfbdf70feba27adf1453/rorirokibef.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/51426a5c5b13a6d9005ed41dafd647b0/46912542892.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/jozuxon.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/46681392159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=scout+sunday+2019PDF 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_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 20604 bytes
SHA-256: 0651517966fff4054eb3a04040ac9586b58e34a7a7604d5f51342947317107ac
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 10744 bytes
SHA-256: 86490636205e3312be7a743186c91ce076b7075f448663be4ecd2b064c98aad6
font_02_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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