Malicious PDF — malware analysis report

Static analysis result for SHA-256 13827fb056cee560…

MALICIOUS

PDF

70.9 KB Created: 2021-09-22 14:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b0bf632d0ce3799462f94b5009445b3 SHA-1: 574c5dae0fc5ad2123e4d5f599eac6b16b90f614 SHA-256: 13827fb056cee560370a52b2302a7c1700a2f8ab97791672b990408088b57c9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://generoussecurity.com/uploads/16124289584.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136936c63334---1376719273.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/46750182421.pdfIn PDF document text
    • http://erictex.com/ufiles/files/duvitasunevixugivabafif.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/88235019673.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/nuxubesafedawazidavob.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/81158638781.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/34578244147.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/nolotijisoraxufapigi.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/33364001668.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/domelawuvo.pdfIn PDF document text
    • https://conrays.ru/f/data/naretiwamesipog.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df16e5c283---41652384239.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/tovajediz.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/15170941651.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/7473074472.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/lorikorirexozinotokabux.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/43728645011.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/61607997525.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/4348264839.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/17409217294.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/29iffrnt5s7nut7rhp0obolir0/64469995159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=face+chat+apk+modPDF 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_off0000b422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 16568 bytes
SHA-256: 36f65fbb9dc316883b7bc62574442ddcf0eabe966b6821ec6c3882cbba3a08fe
font_02_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10336 bytes
SHA-256: dc3644db2553f406e872c9fed34da1665ba6c8eaa3aaa0c3736bd9dbd61420af