Malicious PDF — malware analysis report

Static analysis result for SHA-256 301c1b74c677bedc…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 13:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49015f404216e63d608736c2b460968d SHA-1: 96b6a088765979fa223147d0de57ea30e0cc6925 SHA-256: 301c1b74c677bedcfcf4ea69bc00d2f6664f2cfbd9b9d5fbfcde4aa4676b65f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristic firings and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/88633089249.pdf In PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/ferufimejizuxosani.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/nivupewaruliganapef.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/89qbv4h4jcbab889mc1sd4c6qd/72960794622.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/43124635316.pdfIn PDF document text
    • https://amblamy.ee/upload/file/93444798990.pdfIn PDF document text
    • https://x-software.cz/data/file/namuvenidisos.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79721848334.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b72130c9---32903233621.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/19b5256eee8e36e184c8a973ed3e736b/vajidusunigurutubu.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/rutofekopaw.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/81779949871.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/kulamisejevebikiweg.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/rovototufoboru.pdfIn PDF document text
    • http://fields-on-earth.com/nozijawakiwedokimiban.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fe948f6ed789c6459982ef3649e839ec/53578879421.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7333e0305b6b0d7d03f29f05e37ee5e7/47206927844.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094d85d451c9---pujilililotubedewupedofe.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/71372714768.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/7c1074468f2a143f76ce97a558a2f63d/tawifiduzexefege.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/jabifewikefumola.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/p0b83tp0ltbq4vn2it6p6f4c23/watifex.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1352d356---kikeleneru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tatayan+book+pdfPDF 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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 17480 bytes
SHA-256: 8d34e613ba9848294c186bb934b27824820cabefa81fd8242cddf168c2dcee09
font_01_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 10260 bytes
SHA-256: 7921cf1eeb5b2e7c82234f436d0eeb0a4ab93cd41b21ee5c74c8e728de90ac8d
font_02_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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