Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb180df5ed08c3f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 13:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20c135816c80e73124efaceef6b3e189 SHA-1: c803ab18f88fa8257e6171301ab80ec62cccf855 SHA-256: 4bb180df5ed08c3fa4189d2bc3ce9481f0811ce4858db769694f2aa5e94dd29a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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.
  • 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://greensquares.in/userfiles/file///87071459286.pdf In PDF document text
    • http://invismortgagebroker.com/images/file/nupanuvovoxemewofoja.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/jekezexekogira.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/lodalapizegejam.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b37c348b5a---siwimisuwigafipozejimi.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/gakejovewinebubum.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b344da5c6---bofibevigafevemaz.pdfIn PDF document text
    • https://phukienbep.net/media/files/finedi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f0e024c0df592e8d5fcae69f686cf29a/towexeveron.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/migomukixumajefixo.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/82873331626.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/kewobigejav.pdfIn PDF document text
    • http://esistore.be/userfiles/file/dapaniropiw.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/zozakiwexenipep.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/fetex.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/14960349010.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/gijamavesotetawed.pdfIn PDF document text
    • http://strahyi.ru/images/file/wifutubikisogorozasodefo.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/55426584057.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/3961861074.pdfIn PDF document text
    • http://retailcop.ca/files/90591285333.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/60831715425.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/sobunebixawoxus.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/4818717259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+sim+toolkit+on+androidPDF 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_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 17208 bytes
SHA-256: c0262ecb8a9130a575355f0430c5be6681cb44bac7e2cb573b58b53dba4eeffa
font_02_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 10464 bytes
SHA-256: 8c4cf248f73eb42ba9c6e770edfd94177c60d8880f3da554c551b58b2d8e7aa9

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