Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed364995f2c2e739…

MALICIOUS

PDF

74.9 KB Created: 2021-10-03 13:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8c4cf209a0430e63c331f307149f7233 SHA-1: dde357f9fecaaf00c531a6fdd31668e011e5c3ae SHA-256: ed364995f2c2e7391f47a39d329b356c43002da5afaef0dc9a1fa3f3b4672808
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that redirect to compromised websites or disposable hosting. The primary purpose appears to be directing users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://inwebjor.ru/uplcv?utm_term=upper+extremity+exercises+occupational+therapy+pdf PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613faf21987b5---fajiwazokolib.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/93406764165.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161595f9c85469---96585782935.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/73833552427.pdfIn PDF document text
    • http://wwstationery.com/files/file/jepor.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vonidaxofiguwejabodi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/38625675266.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/71e1df55887dedd6373bb003b57932bc/koxiretebi.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/gizagurogorobor.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68525017992.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/sefatizuvijitawezivid.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149dc9edaa9b---25726363879.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff71fbd4a7---42210520311.pdfIn PDF document text
    • https://cargobull.cz/res/file/relajam.pdfIn PDF document text
    • https://jobtiara.com/files/files/76769880868.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/lozikegev.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144895e2d370---rizepuwup.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/87212658929.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/wimalinetugoperipilufimu.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/24136473830.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/vavavejarizuragaf.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/50213961414.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210916033041.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/wexulekizapedok.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/sozawapipo.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/64500253539.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_off0000b8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D3 11208 bytes
SHA-256: 3d385e56d4da2517daac1e5f9d5a3e4c37ca206019f10577af852b1825fc931f
font_01_sfnt_off0000d2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 19740 bytes
SHA-256: 5dcb96b09248d6afe736b7cc2223be92a99d590740aab83077e5d08dbd31a098
font_02_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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