Malicious PDF — malware analysis report

Static analysis result for SHA-256 280f0a4c6527dafb…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 19:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7ad9ecec78596bb05065babeaa139e3 SHA-1: ee3f72a94bf620e1c8ad148dea9bbc3ff9589620 SHA-256: 280f0a4c6527dafbabb8ea80b6a28e5ff4624d7c53a06c16aa5af3a98809b841
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://kleinschadenexpert.de/userfiles/file/duzofuziwanewejumavot.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5add9eb6c20d2fdccf1ad7e22233e1c0/69797367394.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/43692264977.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/zumefatadowupese.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/67984827645.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/nifegonowezaxuweke.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/26754562324.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///14908524230.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/53340912541.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd4cf3eca---rirapagaxaturaso.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/70455096892.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/mopimuwerebosujibixer.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/kemajadabasefer.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613041242cc4f---wuriresiviwevawajekip.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/11170201815.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/vunowitagevig.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/70931055751.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631089109.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/35952582708.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eace0eebeb---wubezuzeduzotumalaxogij.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/dajegolotivapo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad735f4ea---41225081963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=square+roots+of+negative+numbers+worksheet+pdfPDF 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_off0000c2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DA 11604 bytes
SHA-256: bb84d473b69df74a9b0eda21fec8f37a294cb71c7038a1e1deece90356c1b248
font_01_sfnt_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 16764 bytes
SHA-256: 0914ff92b726d1a904960c826f54cab6a0c7ef084722e702869683d174e76504
font_02_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1