Malicious PDF — malware analysis report

Static analysis result for SHA-256 71da62176e465b66…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 22:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db739e6e893d61eb152567995de7ebea SHA-1: d5758679c08d9d9556f8f44ced0513c2875f2be7 SHA-256: 71da62176e465b6600d963f1de3b19f8899d4c9f3f1fe46945a84051b59f15ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=persona+5+klwp+theme PDF link annotation
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/vhjr47hflftkd5asqmg9rlek50/6423838626.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/59006287390.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/mewuxumakorat.pdfIn PDF document text
    • https://birotex.rs/images/files/fikedoxuxujeturunapikaj.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/votataxiruni.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/16276663028.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/49105678157.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc6934009---42941397809.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/38283077748.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/jofilaletaz.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/65600119269.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecd26d3399---bamipuvekazinapuxivewew.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/wodomareripasavabagi.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1larl033julc58hbk5ka6erigp/69784882306.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/fosiruranosuw.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/najesa.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/fosuxunivepoxozonezorusu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/624b262700429d0010bfdcfa517c00cc/pemobofanazemagadaj.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fe518d34adb83a8e4c6dfccfd4d12bde/61997992639.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/fapasetisuvorelorene.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/zuvomumejitolirotemaputam.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/48861488907.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0ea48f3705663aef78d47f51fc14a8fb/60802356950.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/tefuf.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_off0000b3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CF 15836 bytes
SHA-256: f4d31b564dba955faab36cb754d3598a60c3cd1213c08c484c873eca37b52919
font_01_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 10736 bytes
SHA-256: 945bc4a0bc2b561db4de2b49bb7e958b45123682e90a4e95edeb4918393c886c
font_02_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1