Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba33edc49769d8f…

MALICIOUS

PDF

118.1 KB Created: 2021-09-07 05:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 520acd4518cee7a8a87f9fa9e02dac9b SHA-1: 20b7ef36e311574962378641387fc088c96a7b90 SHA-256: 5ba33edc49769d8f4b83a7b92d21dd10c366e4ec62f24dc0c8843f1594336ee3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the link farm structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/uplcv?utm_term=striker+4+owners+manual PDF link annotation
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3bc876fa839d1060f650c0817fd86b7c/bazijonig.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b60b72ae6ae6a4e4418d80a773cfb72e/zoluwevizibufu.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/sugasuzet.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/2e096c9c15115944895c1daafdcef12c/xetukidule.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/vabagofexofe.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/mopurimofelir.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609635da6c2ed---wimotelos.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/wagenedoked.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/sodapunazenavifu.pdfIn PDF document text
    • https://actorconseil.com/files/file/nizixeluzanikupesizetuze.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8e49i3i48gq0tqqie1mm1hurtk/zabizenubodedax.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b700e3f846---8452280283.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ift1tss5vg73nl42bgf26pvaon/zekiritesiwonavos.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/fuletozawebigavosuwix.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/168hf5l6velrsnsm1jci6b4fhp/xazowinezupitafitizolidar.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wukon.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/19294692088.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/jijazekono.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5u5tslupt347a7cni4emjvlcvs/69827931191.pdfIn PDF document text
    • http://activsport.ro/userfiles/file/verawaluvijok.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/133069624.pdfIn PDF document text
    • http://fullx.net/files/8118856050.pdfIn PDF document text
    • 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_off00016658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E6A 19644 bytes
SHA-256: eb95978400973ac1b8e78d58b77ddee4296fb3809f42a4ac0d56c2016d65635b
font_02_sfnt_off0001b214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B214 10700 bytes
SHA-256: 5767b0889a5750784366eb7ab655657fb5a3867f44a08eeaad3fcab7a6ec2a2d

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