Malicious PDF — malware analysis report

Static analysis result for SHA-256 70eb9d5bdcce75ad…

MALICIOUS

PDF

87.3 KB Created: 2021-08-05 02:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 020f61b14a9d99a26f0ff069053751d7 SHA-1: d42a94285db5c828b19ab0050b953e4741ef9540 SHA-256: 70eb9d5bdcce75adb325bc4961f18c0170c6ad21e7466ce660ac12b47d4b9405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the primary attack vector appears to be the extensive use of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://synerhu.ru/uplcv?utm_term=adding+and+subtracting+decimals+word+problems+worksheets+4th+grade+pdf PDF link annotation
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d8000e29---63252888343.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608222b3e94dc---48273841799.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d46f3a00f5095da904f4e2ab6e1bae2b/30050538490.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3a7b0aaf1959b5ae3b02ab110060ebd7/29552487041.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/61609189100.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f997d25d395---61200932704.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ca1b834e4---93630629574.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/xebegagujaderalufobo.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/1353219273.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c039c1414---vuxegizakupe.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/gixubegixaxoladufini.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a773f4e60cfc804a1d89ffba888e98f0/43666078299.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/99953666597.pdfIn PDF document text
    • https://jobtiara.com/files/files/19757679776.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/1532513537.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/mojudefu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf6d5e73b---fumozisezegokogaxedib.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97b88c491---nomimagigibunirotalub.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/mavogowufofewofimuwin.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/wuminaz.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/kbnvdmmmn9r7u54m1leeeualo5/putegokulufosojiwowelo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/lprve528tjeedgq0qbrslkqtvr/72315827265.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_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 16528 bytes
SHA-256: c7240071c2fdde727b9e4949482ce4e1b61567933302da3d97c78ed4b27f97d1
font_01_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 11544 bytes
SHA-256: 13fd8445842703fc90fdfd1b0e2b4d1053650db472037b960c6d87239ec93b8a

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