Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc7df9fb594f22b…

MALICIOUS

PDF

88.5 KB Created: 2021-08-01 15:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3a37f772e5466e3aec057a2013506b8b SHA-1: 2225ec9a38c2469568fabc397b509150a2dcb634 SHA-256: 9bc7df9fb594f22b4822dfb93b9086653137c494f40cddd3caafedf546a2b311
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to manipulate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://flirtproducties.nl/ckfinder/userfiles/files/21503756942.pdf In PDF document text
    • http://delve-cr.com/uploads/didinafexoduf.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/39441936.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5df9d18f6---sogasapumapamodagajelupis.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4a9252004a3c45cedfb03a4d99ebbf0d/98520241015.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/mumujaz.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/sepanufidif.pdfIn PDF document text
    • https://schmitz.cz/res/file/rogis.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/10860879643.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/31b76c41ded971c58a16dd8260fbe56a/22278516194.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/86637037863.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/vogigopevisamubuzigitu.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/5987455951.pdfIn PDF document text
    • https://steammining.com/userfiles/file/24149850116.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083100690a96---baxukumedisajowev.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eff47582c---2799199740.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/hb9h549bp2jglq4vs98h3bl4vm/59259871775.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/13848346925.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/21105876689.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489c245000---nadugututatuta.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/46889051483.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/nudagiziwijojexegosezi.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/28t4ldq3hfj8l5jep5qg681tbg/lipez.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/f21o7i9irphks099o9ra1u5nk1/35657360783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cmos+circuit+design+layout+and+simulation+solution+manualPDF 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_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 16864 bytes
SHA-256: 75a4e6e1462f6a21505b9f2bf0b29d72d37318023b7f1dd68a6a01e345b11913
font_02_sfnt_off00013add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADD 10960 bytes
SHA-256: 2c695f49991ea602046cb2e64902032899711d0652d98322eee03d2ebd7b2c73