Malicious PDF — malware analysis report

Static analysis result for SHA-256 f691b9d3adf4cfd2…

MALICIOUS

PDF

103.0 KB Created: 2021-09-18 22:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e7a803bdb00778cbed76b353b706eee SHA-1: ff9d4d8bda683b8ec03557fa9962662a609f009d SHA-256: f691b9d3adf4cfd2730539a443bc00b1660a4cff6bdc07244969306d5a6d3c65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://mahanakhon.pacedev.com/ckupload/files/61488516774.pdf In PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/nusopiwusazerukaxujisuw.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613389496171a---megeki.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/86669851352.pdfIn PDF document text
    • http://panova-art.com/files/file/34265509622.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613792667ec56---wefomuwidobemosa.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/xizamoxelisovunire.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/xovasutoxifa.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/43443845597.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/g887cfs3dgmlsq4pok46eakb53/69158356285.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/texaboruromiwatupovi.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/xafisikunopi.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/2160257466.pdfIn PDF document text
    • http://dfanchem.com/upload/files/81149996649.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/94860570627.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/57254783445.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba345e07d---moven.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/48898469201.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613606c1367fd---somixap.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/kivasipilanabogelefa.pdfIn PDF document text
    • https://ptogel1.com/contents/files/70546052613.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1e44ec1eb---16729945337.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/gebifuteb.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/ligebukitipewumozavigonuv.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/vinevezaxewosakakoxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=movie+my+hero+academia+two+heroesPDF link annotation
    • 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_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FF 24104 bytes
SHA-256: ae3cbfad96d91d13c9ecfa4980626c18cbc42c89f87dfdaff220f6602b428fc7
font_02_sfnt_off0001753d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1753D 10744 bytes
SHA-256: 60f68abb5b85a5ee204a3bf154fe4521052a012a0a2f29b9d346a19e6694e155

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