Malicious PDF — malware analysis report

Static analysis result for SHA-256 8448ccd8fa0136bf…

MALICIOUS

PDF

87.6 KB Created: 2021-06-09 04:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 515d81012e08bb3cede28b56e9ba5492 SHA-1: 3c28a2b89c68ae9d1512be5f0ba7df5424e289db SHA-256: 8448ccd8fa0136bf345b946e5876d72060ef090f681e2402313b9de3ea1e4d0b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded URLs likely serve as the primary mechanism for delivering the attack, potentially leading to credential harvesting or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=concluding+sentence+exercise PDF link annotation
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a1d9d5fa---74313697926.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85c80dac9b---3931975315.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160819fcec0056---52655074457.pdfIn PDF document text
    • http://thongthien.vn/upload/files/jijametegexorutavemekole.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/c2sceo9opf3s1kk118afuc32dn/bulumaxifedukibirufe.pdfIn PDF document text
    • http://centrons.com/uploaded/file/50192293060bec58d6d1fb.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/30742957375.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf4ee4124---5189813821.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ddf8a2a1d42f2fe9dcba99c1cbf3f4c3/koriwumawawe.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6eeee6478---11917561135.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b896b94969---refesisojogejaperapaken.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/33885887387.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0d51263c---36193130262.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/23230884875.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/udo7pcdro4nobs4fsguhvug6kf/17832128657.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/zelebefojil.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7513b0372148f3f9d2b2d3c849554b8c/40827408937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 4872 bytes
SHA-256: 0eeff6cf8a445d53c89c03014838d5fe2ec72cb7e8db80832531fac16dd49554
font_01_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 11428 bytes
SHA-256: 9aaec63e7abe3b0c075ecc8eedc757fe0aa81c8ea697ba75ccd959666d4d31be