Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8c7ba81916a249…

MALICIOUS

PDF

93.5 KB Created: 2021-08-10 02:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02ba104d2f0d2b70b40cfea008d35274 SHA-1: a5ebb17cf5a21bcab2ff5a411be6e30df7eda2da SHA-256: af8c7ba81916a249e4c8ab2b901a89453db37fb5afa4b2b191c6ce29c5986881
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://immobiliareborghi.com/userfiles/files/tafubu.pdf In PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/94956654156.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2915383c76---80214951795.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210709125806_moll6z.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6d0242f2f9c3ac3c36dba5b3f1d84cb0/69303187334.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/gemokesaxijivofejuwutidel.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/73476825886.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/398515a1165f24d7a685dea43133b4f7/75884482418.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c62beff345d---nudokawotomabekepa.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/99506097815.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/jaxagotogurufirunipa.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/45621ca1792437a20523448e9d6b3a54/jarupurukukex.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/acc4f478051756b8078428f76dd47852/viwakaxa.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/69865893426.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/51985013631.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g8et4b6cqf64suhq54j3kf9v86/venagapaxi.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/lurotekunaxoj.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16107bf87d32c4---kipasekifuzidugunoda.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/85965594138.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/69001870369.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c522aacdd20---48319054736.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/17334912116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=why+did+the+movie+cats+get+bad+reviewsPDF 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_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 11064 bytes
SHA-256: 4e9f8ecfcda2751b76c294be54b0a70f55d9faeeda09b1a39a3f5a7b538c529b
font_01_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 17004 bytes
SHA-256: 7db07109d220f11987121851b7a90ceea62627b70ffd6d2c681a05de5cfa7485
font_02_sfnt_off00014f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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