Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dfd7b2f340c3ac…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 12:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de7470e90eab4e6e6c1474d6f95a3141 SHA-1: c67c2d024436fc3d2fc58147f10a90f03468d6d5 SHA-256: d9dfd7b2f340c3ac4a6698affef452bd1d4042989126974fc67f18a0d1870cac
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a tactic to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a86178945---pugonadozakadifovemeban.pdf In PDF document text
    • http://punaide.com/userfiles/files/81544970043.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/61537536157.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210905121600.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613697f6646f8---zobobigalaxunagifamikeka.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/rorafapamowerobujedum.pdfIn PDF document text
    • http://termocity.by/pics/files/43718573934.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/faravegetijezep.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/gugatikaxetu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6c41a8afaf3375ae06cb06fd545dd449/17147176216.pdfIn PDF document text
    • http://samtekelektrik.com/files/vujizoduzutig.pdfIn PDF document text
    • https://datenglagi.com/contents/files/23103196828.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/t0878f3v1qtnbqtiaoee89hck3/labadovoxasiluruporofanax.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/igegorigojumiv.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/xawawotifilagoludere.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/fupolusatefalupuxase.pdfIn PDF document text
    • https://haidangpc.com/contents/files/73797157198.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/65198927042.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/89114020245.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/65661271249.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/didewagitiwufejepam.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vixalisejokosurug.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/03j476qhe6ffnqinkl2f2rko36/fomikefobijagidifutagupe.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c73b99f9d9714b5be15552b6b9cda67e/26703611289.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342720ddb7b---2054071464.pdfIn PDF document text
    • http://blueyee.com/upload/file/070746546243.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/14484864974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pottery+2+mod+apkPDF 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_off0000d1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 17576 bytes
SHA-256: 02ce99b97239e00324fe11287e723a2793ce3fd4051c472d30e952bb6cf79057
font_02_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 10472 bytes
SHA-256: 6d46fb3f4be124a09f826a80864c84ab86eb3d38cb85758d74ec6ecd7877dbf5