Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0e8516d78275fe…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 16:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d340c8fbab5ce7f6192db38cf73e8ee5 SHA-1: b5f520cfb49c742b3a815a17b2f514ee011afeeb SHA-256: 6f0e8516d78275fed651e11b92de18d4007fec7de7e203661191f80fe712f708
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/woruzorenumur.pdf In PDF document text
    • http://sipzip.com/userfiles/file/fininivaronosisem.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/h22vq42tcl1fn489e3qqgidqq5/89437619072.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/22002574061.pdfIn PDF document text
    • https://geloracinta.com/contents/files/22166722490.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/83903083612.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/4085058578.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/47415612413.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/12886275722.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/finabisigesidin.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/16527901172.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613d442b13a1c---bowid.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/fubipupuguxe.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/87735032374.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/16913320104.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16305842760dcd2ade339a3d7ce132.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143d022971e7---petufukenanovefovevup.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/87590316712.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/67388483595.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210913111956.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/nifurinesojokikizuxofigil.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/likuxivenizav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=prominence+poker+androidPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/25f0eca589b5fc0080e7075f6432e340/fetinuxapuzug.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_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 18416 bytes
SHA-256: 6bf39e46c0c6ee9153ad904ae3095efb645e05447d330588e2649fc5f152f38f
font_01_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 10456 bytes
SHA-256: 341fa7b7acc3fb3da7e97cf1604fbb614d1c39ac9e65b870821eddb537804c9f