Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbeefc2d4722629…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 05:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f5d1b8c73b95a9c74e6cc66c75e9105 SHA-1: 7531f3a85b2cc48bb6c29e09f165357d45c9142d SHA-256: 9dbeefc2d47226293708f13defce050f4c042ea0c1d57edf4986d0d73c68210f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=top+ten+random+video+chat+app PDF link annotation
    • https://hanedantoptan.com/upload/files/rexaxevowipomegozevap.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109071237185419.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/kuwijikubetiduwejizibo.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/titatugazusujuwajogovis.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/66503415301.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/630835d511845ad4a9cbf48e512bff13/tokewig.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/56732531917.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/95079355002.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d31e2e01e---wekatezuluxe.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/90913470123.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161467e7dd2e22---55368343907.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/mabowowuxudofikid.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/62382105266.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109150920591461.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614652a992198---xajipujol.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/zizexone.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/63990732728.pdfIn PDF document text
    • http://fourfoods.com/images/files/xodok.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/95202752193.pdfIn PDF document text
    • http://carszana.com/image/upload/File/42138964493.pdfIn PDF document text
    • http://thaide.org/userfiles/file/xawademovodizivekib.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_off0000df9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 17588 bytes
SHA-256: 806963b960436ee3aadd7585a7f50829f1945ba4f0f4c2cf5ce34875ba2306fe
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 10596 bytes
SHA-256: 6bb15838c7e731ea258a84b3dd24b4a1a5348d3169d9fbb68cfb8f99313cb9c6