Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee43f18677d5e09a…

MALICIOUS

PDF

75.0 KB Created: 2021-08-29 13:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38a33280e17ce00bb2dd04d7984094a5 SHA-1: e85096ed0b87ee14562d9714a3e1f027efdfc889 SHA-256: ee43f18677d5e09a932dbb73fd0a420bde723a8c5e6ae8dff0c7cb77bdbfbb8f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to websites hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF link farm heuristics strongly supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6uvp7k4evmejt5hgc280h5ete0/kapijuxipijone.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16084eeb38b092---93810644897.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/56398985017.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/28493e165a878948b63aa47b9cc812f7/fapubugofaxide.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hpr8eauvl8sd9l53m4pva7qhtg/banobul.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/zegegalazidopukawa.pdfIn PDF document text
    • https://medpressa.ru/files/file/tivufumat.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b009df3a10091a7720c77955e9196f40/mituxoxeriduw.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/55783171339.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/35286085853.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/81uouu071r5mq2rbk9enf478e3/jejakumelerunufeni.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/1c6296cba78b537b80abb9a8c1825258/86334684054.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e61b1c8a202---wogeripagaxagikixuja.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/58064504976.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/43477984311.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5eb335f31e0f6b721e40df52b266d442/jadirasuvukidubukupemerad.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/46643998812.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d0199d0701827f9cd02deb912907ca58/namene.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/99550917851.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/padewuwijupipixisemamolu.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/26512622459.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/85792328352.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/23792168633.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/27108909110.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/88307870801.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/61614145780.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/42066745795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=allusions+in+tkamPDF 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_off0000c303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC303 16488 bytes
SHA-256: 34c4d46002bc5089d9f998ee0de83217c1dbf1417d9cb37a06f53d2283ba6665
font_01_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 10208 bytes
SHA-256: e28f0f27582edf157743b45ee4828f5c209815bbe6477eeb363ff31bc61da93e
font_02_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1