Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7905a66e1c52200…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 12:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d159260be592f4a4d602cd36ca6b8296 SHA-1: c5f100b0d43c14680552916adf1397f1feff0f72 SHA-256: d7905a66e1c52200bcae0b9e7e623abd2bb912ae57089172a71b6147ac05737a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to trick users into visiting malicious 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://synerhu.ru/uplcv?utm_term=windows+10+rom+for+android PDF link annotation
    • http://ngoinvest.com/uploads/ckfinder/files/jonokefabakezoru.pdfIn PDF document text
    • https://galafrica.actstudio.ro/app/webroot/ckupload/files/fudabifezikakadarave.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/vamanalemovugopizib.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614590ea76868---tanut.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/78962362361.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/2987476792.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/66468034709.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/36622938380.pdfIn PDF document text
    • http://nscenter.cn/upload/files/legogujotanukem.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/85915860420.pdfIn PDF document text
    • http://i-dron.cz/data/file/87887747391.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kovobojil.pdfIn PDF document text
    • http://orenprom.com/img/account/file/27272957314.pdfIn PDF document text
    • http://vollaracis.com/UserFiles/file/50626933084.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/24565799215.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce74bf022---73542911897.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/87449015225.pdfIn PDF document text
    • http://amandamaitland.com/images/file/37830043922.pdfIn PDF document text
    • http://thecuriosityshot.com/35320116966.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/xagiwupen.pdfIn PDF document text
    • http://idcla.net/upload/files/69132551901.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5cabd9552---fumusewifozovenujadaf.pdfIn PDF document text
    • http://www.tvmreza.tv/ckfinder/userfiles/files/zotijavazafanejor.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/wipakigejufaniwi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140120131197---kekametamuxufobere.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f36d7d4a---rebulivunanujosofowe.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_off0000b962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 15572 bytes
SHA-256: c2699a470de2ae6dab3403111a4adc0a81758b536f2405e35ef9e4c505a2b192
font_02_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 10492 bytes
SHA-256: 7c0fe2312e6ab3cdcdb3bf201308027219b6d0dc307669c72b8a693610a93e30

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