Malicious PDF — malware analysis report

Static analysis result for SHA-256 de30c0e81955dcff…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 21:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62066072f4aaa4dc3eebb74eddbd832e SHA-1: 6356ee0b7ba0cedd94cea0688d3240355ff3cd76 SHA-256: de30c0e81955dcff2cf8e51d87c59c48e680ee325c04e00059c63a95a5ccff75
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate it likely exploits PDF vulnerabilities to redirect users to external sites, potentially for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://joyerialaplaza.com/ckfinder/userfiles/files/lasobalelekazifu.pdf In PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48712120232.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/l1sj9ook83haqd856k1ccp813r/mebaxav.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210903085114190.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/soruropu.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/kefiru.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303b2111025---91885242856.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/kodowekagapi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3a80300c---juvirosakevuzud.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/98098433749.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1ad1b2de---nevog.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/9114535922.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/74403209764.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/63076984116.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/23358297307.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/tenixem.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132eed9d1547---66942969217.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/dumesowezinejobozo.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/mumojawanonesalanufame.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/topeliweliwa.pdfIn PDF document text
    • http://videlec.be/ressource/file/jijebufavojav.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/55528031590.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad98e9afa5---19501175553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+robux+generator+no+human+verification+legitPDF 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_off0000c356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 11000 bytes
SHA-256: 8672cdcaaf47a1d5b23ce74a34e0d01d6e2b8ee1031f3c6c8d96bd04006d8205
font_02_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 16468 bytes
SHA-256: cf67c2e1786e2f7e459e7947ba145be9bd4b6123dc73cadc92ca5c57b25d8b2c

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