Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b3e25fed7f69ca…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 13:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5651d2246fd0cc6a00b3a003b5480b50 SHA-1: 070087711a445f399aef5bc070278fa723c49201 SHA-256: d6b3e25fed7f69cade707883a74a2763fa951010b483761549fcd874cc013aa2
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in one URL indicates a potential tracking mechanism for user engagement with lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=super+mario+3d+land+nintendo+3ds+rom PDF link annotation
    • https://tatsolarlight.com/uploads/files/77866159376.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/38100873947.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_191837.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/baxizi.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/josasabujotasowim.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/giveriri.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/11381447400.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/fevazezawerasupalevexuxu.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/tufexobanenivopuraba.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/54315072167.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/60694900958.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2b1bf6be---20473502577.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/91647253809.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130300e4ed2e---63017981714.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e518b2f1---59776054371.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/sazigodi.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/164896712613c68900b356.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/70656868133.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/41259394556.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a0a2bbc5c7c9fa55058c006d7278eebb/bojixalibovokame.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///62408938159.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/67576047533.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_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 10900 bytes
SHA-256: db0ff7a2e5340e179a2ad78515579f84ea8c63938a80b71133621e374430a35d
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 20320 bytes
SHA-256: e1eb7b5df247927a1e444394c2d2bf2d6b2d80ce39de570f255a8f44b4527374
font_02_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1