Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae638c76665cee2…

MALICIOUS

PDF

87.7 KB Created: 2021-08-31 01:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de0b65fefad97f12f3546e9df614979f SHA-1: f4751b2de19f118eb15d26143452f092db470701 SHA-256: 9ae638c76665cee22befd5081dde09b2d2fd441b07e99f383f1d3cd6ece9f900
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ajwatravel.com/wheelmarine/userfiles/file/wodiwadadibawowume.pdf In PDF document text
    • https://dragulf.no/files/file/89135029840.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c6bcf69db05425fb82505fe98be04eb8/miwaj.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/keredesaruvezudu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c1125e68d98fa4b97b74015c81f0fd22/rofawovopuvege.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/78328344190.pdfIn PDF document text
    • https://irantruck.ir/data/file/vaxuwufibusixenivinufalug.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///rimipifa.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xitonitujulutunisuweda.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/dugoxiniruroxe.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/16549831715.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/60454181483.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/dokukijatujuviti.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/89149781826.pdfIn PDF document text
    • http://beateromer.com/bilder/file/sorifitunurosogigu.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/95255805422.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/6194934260.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ddc349644---43844120372.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gewupujopuziwipokazigoto.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1c02388f3f2ce475a12b4d8d69b43130/fulabeke.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd64b2d445---75354968338.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dprtglavqg1st5ff97th1stea/32754089273.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9329e98bee---wedipinekizir.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/5052212616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=semi+monthly+is+how+many+pay+periodsPDF 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_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 17344 bytes
SHA-256: 7462c2992377100eb0b7102fb868e4d3811120f86ec7240ef874eb88ab3b5d7e
font_02_sfnt_off000136fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FB 10932 bytes
SHA-256: cb33b14b00d51686001698bb8b3fb47e801788376e573653c33ab7c856ae01a1

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