Malicious PDF — malware analysis report

Static analysis result for SHA-256 899fbca3625326f4…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 04:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54468212e354fe0ca39f3cd46d73bb3f SHA-1: 6c0ff59eac1c1e3e14acd3c4c5fdbd4a4c6ef011 SHA-256: 899fbca3625326f416be6bd66cbf92bf914ad725a2696aad017eea0b8dd42657
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=encouraging+words+starting+with+p PDF link annotation
    • https://adeptos.clevercloud.pt/images/items/files/74616309110.pdfIn PDF document text
    • https://gilbertems.com/videos/file/nebinufopo.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/tiluge.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0525pcd2vm97vc9777ensjc3uh/gafesozijixumewuv.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/febupewuzukaka.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/73764080351.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/80274177918.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/jizezopibetetimesakebikuv.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/fizixulajoduf.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/wipuwemawizojeniboge.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/98829898583.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/97065431360.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/26460227528.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/71981003687.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/givenavoropavidodem.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/15112879177.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/vabuda.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f34f1c0a3a---nuwibovekutonejeburiv.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/41230263649.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/nabadofubibe.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/luset.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/rorinejolavemode.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/02b90622ff40f0fef31bb6ee97451b3c/zedosawon.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/4738012281.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/rutagaxejerenoku.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_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 17608 bytes
SHA-256: aba93c64e76f39c1bd6afe332a8f7bafb4dc875a699b9f6a2047704667d1492b
font_01_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 10784 bytes
SHA-256: 4c42c05852b2b215273330bfa16387868ba75a03e56a9b4fd972023f4f031e6f
font_02_sfnt_off0001396a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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