Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ce78e4fd34a296…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 17:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d312333d57cdd47d908e153f771a1230 SHA-1: a6a7bd3c19837099406edd80351d95e592329731 SHA-256: 89ce78e4fd34a296534af74a72604690130a1d5d6c60961538529ef45682371d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern observed is the use of a link farm to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4358d399---jozosezezog.pdf In PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/wakis.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b7b5062b4fdf63f5403b4f62c3e1b965/bebirebevi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613754e4be181---75434382643.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/dirimolemesog.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/11666719154.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b4d43a1e---44692090393.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0f7b9b51---nazuliwanugorilofolewara.pdfIn PDF document text
    • http://wmsone.com/eimages/file/98288405540.pdfIn PDF document text
    • http://mega.kz/media/upload/files/tijuvoda.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/gobufomivirorujaxowepu.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/68377909694.pdfIn PDF document text
    • https://pecintajp.com/contents/files/48907422035.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/34925242458.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/71539523894.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/adf93572f69e2a97bc05b687bf291c3d/fimidapadoribomasigazol.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/72936216359.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/13924816526.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/k2vivlg1djhvm24gt71c96lub3/81839616930.pdfIn PDF document text
    • http://le383.com/uploads/files/waxugubakiwezav.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/momodajaketitalupusileju.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b239c913---56699770448.pdfIn PDF document text
    • http://boki.hu/editor_up/82485011498.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/5467912207.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/78049290754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=unique+words+that+start+with+pPDF 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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 10780 bytes
SHA-256: d23726d244382b0d2b2ff3e1032d3a12aa7cf498e2bc4b8d8d7b3e521ff33c04
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 16568 bytes
SHA-256: df34ead6f7ba44213cfd06447ae933a9c063311f324c24bacae0ac22a755b51f

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