Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9c06a89f585c98…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 12:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b6dceacafdb085d4f491309a9fb1fe9 SHA-1: 8bb3feedfc9eac69838b31ba915d0f869e6e046a SHA-256: 1c9c06a89f585c9816eb1864752fd7ebffaa1a65795a9c869cdeb83dabf638ff
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload storage. The heuristic 'SE_URGENCY_LURE' suggests the document attempts to create a sense of urgency to prompt user interaction. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=zelda%27s+lullaby+12+hole+ocarina+sheet+music PDF link annotation
    • http://www.addvanceo.info/userfiles/files/wonamolak.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/41703141892.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/80407508179.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/geguxowudufot.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/256bpqd10vgekkgi4stpfibu32/denijele.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/40988591118.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/sulejezaxunabi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31d5ec61a---fasufewegejop.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead17d21e8---vujupaberegabujiw.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143326e5bc3f---84746803995.pdfIn PDF document text
    • http://meta-min.com/files/vugaju.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/zukidugawetuxo.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m2gbvab13ubgjeq37e78jrjq35/50396175222.pdfIn PDF document text
    • http://cga82.com/admin/File/71127246825.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/rasixofuwitimikudadova.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/45405048815.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/xafezer.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/75861688986.pdfIn PDF document text
    • http://7profi.net/userfiles/file/posaw.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/pazeropupenonin.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/nuxutiwipegi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/53339858394.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/zaziposawotutuz.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137637783559---82272512128.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/63844474459.pdfIn PDF document text
    • 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_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 11160 bytes
SHA-256: 577464feb489cdabe27137403c43a38bce7f81c45906410b8c2a49816b634ba1
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 18124 bytes
SHA-256: 4fcfeb23e5a89c0355fde5789121396be4f6dfac2db745be08ae0e2bc985a7f8

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