Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea4af8022f22f52…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 17:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93c3e57945e32312227af33643b0c292 SHA-1: fa9807f825f12c44b1f579c5ff7c239ff48c8b47 SHA-256: dea4af8022f22f524642f531c989d31a0a93d972394eb2b1c34d1fdaee77a72f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document structure suggests it functions as a link farm to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://oniceh.ru/uplcv?utm_term=android+system+not+updating PDF link annotation
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/62041705857.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/87822807627.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/89636930560.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/56150630146.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/budazodinawunolujoki.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/rikerudedokosob.pdfIn PDF document text
    • https://rippa.pt/files/file/kitazinutu.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/85082914094.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426f9bb3265---mugaxukazarevid.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/60717898816.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16142d4528056f---58720841200.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/l02c9hcorv7taei60pj54r4gn2/17973931798.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/namufigozir.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091601564183.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/136034652.pdfIn PDF document text
    • http://wdnederland.nl/file/relevubomizepexurirur.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c0e9b6740330cdd98d9b35260c37aa84/kumifivipi.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/nozitigokijajegixoxet.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/jovirikipufosukili.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a8fbfd8959156c2765c12e74ca2c2fb2/dotuwetudofazosetugeju.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0acacd19c4f927548bf7693c3693ec10/xifugolewomibev.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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 18968 bytes
SHA-256: db9595d60e6240d6176232cc1fe2435a98711f4f128aeddd7d2fe3554fa48182
font_01_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB1 10884 bytes
SHA-256: f9f836ef90ae12de2ab6dbeff2e50e6439e653211bd9edfd0f4e2f9ea361ecf9