Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba33c53ba1604d30…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 01:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f7870a75579fdf31cd7da62f2cd69eb SHA-1: f1307c8fa4543945cc796d2b5a74513e5ad8b82a SHA-256: ba33c53ba1604d309a2eea63509d97148b1a69891abd7b08e3903a10a689df34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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, directing users to various compromised WordPress sites and disposable hosting domains, likely to distribute further malware or phishing content. The presence of multiple PDF-related heuristics and the ML detection strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5b086berm97agttare3aav141t/30004538055.pdf In PDF document text
    • http://zubrcup.by/files/files/30775692751.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/93855914268.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90410021660.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/98d6ed59106347bc3af66f411fce4194/tugamipugagazus.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210514191359.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/74193458908.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/kuraditavasizofejuli.pdfIn PDF document text
    • http://short-story.ru/upload/file/kegamisajotipusepanoro.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/270427e1306a4fbf0cd3ac4d29972558/tunudemevediseratobipi.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/66526505834.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pabijobutedamopagas.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089761285cd3---73782232910.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a0b4e01b8d1240dcc4a9e4250d990a57/4132330093.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/72875968820.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/pejadivawulubigudanexib.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de5ed5f50---rejulebusabivuxezamikejo.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/lifosiririduvezavewagi.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/jivogilafu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/kufexamowoxatem.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/begenamemo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3df3mnrf1eo5tqbbjl1lcgh915/kujapapute.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a80ecc4ca6b9aa9f0562378010f2f704/vaxudexunudezum.pdfIn PDF document text
    • https://ever-progress.com/upload/files/fifuvulagadodusuwapabotep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+viewer+chip+64+bitPDF 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_off0000d037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD037 18636 bytes
SHA-256: c4e726b5bc49bf75382dc75ba8fbea2bb43a475cf3be7a4e00c8ccccef8920d1
font_01_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 10656 bytes
SHA-256: 4a44dc7063e4fc5d7ce9466f2bec199f3d4005c5fb5b46f63949e356944b28c3
font_02_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.