Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cd0d13d1cdebd8…

MALICIOUS

PDF

108.3 KB Created: 2021-09-20 14:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c36c65f4c5d662aaa5520a564001c05 SHA-1: 233521b5acca2854b19fc97d16c13eaf6bf860e4 SHA-256: c8cd0d13d1cdebd88494b60472841187ac58df277cd9695693d5cb977b423727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://oniceh.ru/uplcv?utm_term=gospel+of+luke+commentary+pdf PDF link annotation
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/52473476089.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614526aeac65a---56790677805.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161386b0464a56---fufopiva.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/tativ.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/79546706944.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/2776265904.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fisugogobud.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/gojevumap.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/7435122204.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9dce7a04---74501991518.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614379c791b82---4679820875.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/niliritutada.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/2909887236.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/6426520628.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614304d0cdbef---gupofotawujoredisa.pdfIn PDF document text
    • http://kunbot.com/upload/files/lufodojosoku.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/xavosubumawubizepisulaxu.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/lumetujututuriboredev.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/21611284446.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab63aaf95---ranud.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/15003779757.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/rawufosonosagaba.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/66035642569.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_off000138d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D0 11032 bytes
SHA-256: 14f402b9b61664db4892e7321f84356edef45b8568cb441ea9cbc3305d9e57b8
font_01_sfnt_off00015293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15293 21864 bytes
SHA-256: 298eb3993d2192ee3321098633e78654ed9826a5a1580ffeab7da766ae570d88
font_02_sfnt_off00018bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1