Malicious PDF — malware analysis report

Static analysis result for SHA-256 2173b94dac34c1de…

MALICIOUS

PDF

76.2 KB Created: 2021-06-07 12:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1dcb056d2a4e631b39fc1ae21fe84030 SHA-1: 8eafb7629ee0e5de50d7aef3e7f848a9e1555273 SHA-256: 2173b94dac34c1de6f8849341cd52458f6d6812364043d4f867ad0996be24c38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, suggesting it functions as a link farm for phishing or malware distribution. The embedded content, though heavily obfuscated, appears to be a lure related to 'Skullcandy bluetooth headset charging time'. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=skullcandy+bluetooth+headset+charging+time PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e4175b22---98034718622.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a42cb22fb22d3207e866e3abb5451419/94274986667.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/77u5shi8ava68s6vihq6g8tb24/64348627479.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/82000976035.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/63271220763.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2c9654b4169bb32584551e12578855c2/47454060009.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39444a825---teremujovomibovaradezaso.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dtmtq9inpj5ic1s7l3jt2gtpj7/vaxafobatakerivupopajiniv.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9e4ffff69f4fe8fcdd81e1f33b6a49cd/fepobugasikideligobim.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608873065e55f---davagefaziwugubetus.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4220f0e3a---96154728344.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/69685105159.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/smi9rbd9uuaj2p0diqt79sdfu8/zepixopagem.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744eda2ed2e---80339697909.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f90d76fe6---46398643217.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/gebivus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 5644 bytes
SHA-256: 81f080e4ce2222f327c2bec475fb44b96a1b28490c17af3cc001045e34536ae6
font_01_sfnt_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 10908 bytes
SHA-256: 8957d29be0b9ca39433f265bdfe1348220bd352f81e37215a09ae30d0a725b16
font_02_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333