Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff8951de041e8d4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 06:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd04316fc45e558f6c6e35f2ff894bca SHA-1: 86ed6bdf8355265d630341652be19e5ed17bc791 SHA-256: 5ff8951de041e8d4462d7d54e7e86bd71cd670a91f56306efd1fbda52854a2b4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification strongly suggests malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=android+5.1+update+to+8.0 PDF link annotation
    • http://qdjshg.com/files/file/godewisoberu.pdfIn PDF document text
    • http://dgkno.cn/upload/xenojopuzazirexuwurofijoj.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/75851611716.pdfIn PDF document text
    • https://lordoptika.hu/files/files/gibutolo.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/kegetakeburenet.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/33452953163.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/74202381083.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a806f42df2---16151300940.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/78711164693.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/dokurol.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/o0drr0hjkg5vhq7jvq70kufipb/jokanatinob.pdfIn PDF document text
    • http://boldogelet.hu/media/tozemibevikizo.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/9987771807.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135233cea1a7---kozifekeloga.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46339018723.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/29974657199.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/nazafivuvikebetikuros.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/lonawu.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/guzun.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb091c44d---ledowavixusopadis.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/tijuweganupomirujazig.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/zelusi.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210910062305.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/34985189310.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_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 10836 bytes
SHA-256: b0e4a93ace6cfebc2f5060fe6e3efc51025f3734f549872f6f6fd2dbb2772ec6
font_01_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 18440 bytes
SHA-256: 11f16b0d4ab39c2e3ae2bc387409aa03e865e0671421f0de637acbc7f7eebfd3
font_02_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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