Malicious PDF — malware analysis report

Static analysis result for SHA-256 929b0de11901afde…

MALICIOUS

PDF

72.5 KB Created: 2021-06-12 03:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec2af054a276567554c2d73d1f049ad4 SHA-1: bfb1153f4d192e035b540f9a7f3ec39b87296c99 SHA-256: 929b0de11901afde652089de9ec827e2b9e0dd13beb3436d5922f4dc5b616dc9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous links to compromised websites, many of which are hosted on disposable domains or use URL parameters indicative of link farms. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8868

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=original+blue%2527s+clues+theme+song
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b5k3hmtkrrc087qpj9bausla8/nofanedoz.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c0142457---nojaxisaxanimimulugox.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/nfgsvqh65tk4rr4sa19dni9d4n/72790106784.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d166ba785b7da2f6aff2342f170e6d0b/tazofojizir.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3c44a065---suwadelenanolixobukemid.pdf
    • https://myphi.biz/nbloom/fckuploads/file/45883523088.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b31095baf3f---tamopodufi.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160baa155879e0---batesunoni.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998ab224e95---roxira.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/67da5cc96da5c11e4097eaf1f54b3765/20010388935.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085e33b66b1e---mexibamamekuxof.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/tewewonawatigudanilavuk.pdf
    • http://kiavysocina.cz/UserFiles/File/loxamujamuzukavifolize.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55ae30a95c182bc865f3f0b7805589b2/fiwoferaradugijolorukave.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b408ec2f---poxivukaz.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45ecec9eb---4263278512.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03c.bin
dc756418bc01cd6aae361ebc5adde46d75b194cf75b55845e4f43de3e176be66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 5416 bytes
font_01_sfnt_off0001027e.bin
71d40051cfc552f8fff678d9f68cf8392099da1dffd6f4dbec8f65d015c59e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 10828 bytes

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