Malicious PDF — malware analysis report

Static analysis result for SHA-256 306253d7d591e3f8…

MALICIOUS

PDF

104.6 KB Created: 2021-09-04 01:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4ff60749488bc460e701e9727c6a3c1 SHA-1: 86c0bbd561574d940a974f33f0bb64581f425bfc SHA-256: 306253d7d591e3f82dc4cb3be00ed0fe08c9b0bebcf1c53e3db12561751486a5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://crewmak.ru/uplcv?utm_term=dictionnaire+scientifique+fran%C3%A7ais+arabe+pdf PDF link annotation
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/mpns7oauu28i0i0onlf3pnohfk/disegetipesugok.pdfIn PDF document text
    • http://gkia.org/kingkong/userfiles/files/24176619659.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/jixojupexidudujusavotaxun.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/wabuzineb.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/84774216740.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/vebizubimerasawajorepogo.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/fozuniranigopumofef.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609633b681280---rurenowekemevuzojubenip.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/76509054275.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c64e79caf---gadud.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21f271492---2526011404.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/35747196234.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/zunobefijewodetazi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eb4bc1423---59105136375.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/i1em58rurii9tmt2valt3bojsi/sanuzonovemogujuv.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b882d497023---toxoso.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/bn87je0lr9g2miol4ogfc4vot6/dutevekuzupawuk.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/54204590395.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///jinozuxenowe.pdfIn PDF document text
    • http://afslab.asia/upload/files/74054502963.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb91ab5cdc7---53379039320.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kitibigegamumuxogugo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161084591b67d4---zabudadanikaruxusa.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/30968664905.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_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 11152 bytes
SHA-256: 81517b11ed419b98d3f4c75aa5907249ee2bcb37ae47247e0ff4a42dfc6db82d
font_01_sfnt_off000139c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D9 26436 bytes
SHA-256: e0e34eba744e0b08ff1d009a17db2692ee14c05805147376e4de0b22cbbd2cb1

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