Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee405bf845125a17…

MALICIOUS

PDF

92.3 KB Created: 2021-09-13 19:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 330bbd2612899113a46d3ea6ff6658fa SHA-1: eadeb264e1c98d0c88b16893abb2d8e3cdfab611 SHA-256: ee405bf845125a17a3a1315b50207bd7e99d0b596409b1945089d657164fcaa3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to external URLs, some of which are hosted on compromised CMS uploads. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern. No scripts were extracted, but the overall structure and URL findings suggest the PDF is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=street+fighter+4+arena+apk PDF link annotation
    • https://shieldtech.cz/ckfinder/userfiles/files/70160559059.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/lizetaxizaluja.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/zibonot.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-07/images/files/kosar.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/mesalotitatosaxixit.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/wigusoreb.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372b3ad5a2b---28937299383.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/litabibedevupilelulil.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/wimitaloxekexaja.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41eb76199---22626281806.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/27973772283.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/91aa909204a46b09fd34083dfd0b57f6/50757244274.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/060008508636.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/negewumilodojezabegof.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613887267a086---rubesoravemiganap.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/gaviv.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/dijojidesunivafiwifaribev.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jerufave.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bf5ec8d37---wumamedevufiderajiwe.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/gizapevatumomolamogofi.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/kumemenov.pdfIn PDF document text
    • https://shevian.com/images/file/metorosawesijila.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613561fc5261b---8602057597.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/litipumit.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_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 19488 bytes
SHA-256: a4c030a6b434044ecb6144d7f0b6df55afb3d935ac33805f7f3194f4eeee189b
font_01_sfnt_off000133d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D4 10548 bytes
SHA-256: 72eae9fc149ac982ba7f3d90800c7730145b7d6bf057ed6433e56429294ed766
font_02_sfnt_off00014bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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