Malicious PDF — malware analysis report

Static analysis result for SHA-256 b707387a58a89404…

MALICIOUS

PDF

92.3 KB Created: 2021-09-23 03:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4eb7946022b708093d6d6fce5d8ee70a SHA-1: 2a8a5ea7977a60e5f7a942763634d5ee2f800ca3 SHA-256: b707387a58a894044f41cf8ecb1b04cb6aefd79cda9689d5ff039dc7f14ada08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload storage and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pistant.ru/uplcv?utm_term=after+we+collided+full+movie+123 PDF link annotation
    • http://supair-lux.hu/ckfinder/userfiles/files/51604390085.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/kewipolefazujawuxox.pdfIn PDF document text
    • http://scantech3d.com/files/47746200938.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/71404082382.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/46013100508.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fee27de10e---99845794752.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/95542029227.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/wimekezujusa.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144cffe6ce3f---jifefisamun.pdfIn PDF document text
    • http://eternaseguros.net/files/files/1298431109.pdfIn PDF document text
    • https://kermanrooz.com/img/files/36852783394.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210922150652.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb09e8d24---remefosiniwebapidoboma.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/pegawujajuriwepugu.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/bajajoxabuk.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nuleta.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/wefenavisatafolomazupugam.pdfIn PDF document text
    • https://ratodua.com/contents/files/98716061999.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/jedudaduju.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/jogewijokaxujuvobit.pdfIn PDF document text
    • http://tencanpowder.com/d/files/61994655918.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f347b2df31---6218017561.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/69911592064.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_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 10780 bytes
SHA-256: 0fb668f6b577abda017db34a2df80c3ac121b3d9b18d62e4fc9e89ae487ca09f
font_02_sfnt_off00012cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC1 21064 bytes
SHA-256: b64352782d09de71ee6075f61813f1499f4849290a4217adad129cd6b1ee1393