Malicious PDF — malware analysis report

Static analysis result for SHA-256 1484dbfe5efe4dad…

MALICIOUS

PDF

70.8 KB Created: 2021-06-20 05:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0040be9493d51c22cabb4f619ab36cbe SHA-1: 5dfc06011c0799f26614e1b196fc66e7d4387c89 SHA-256: 1484dbfe5efe4dade5f71018c3d25e57da88c7e06a5f3dbd49b6cc403dfd2c1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to compromised CMS upload storage, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'Download Now' lure further supports this, indicating the document's purpose is to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/41aea6b1e0ceb1853aae7828271af070/51463163338.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b80366da---92599826954.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/e5tbsgik0ard00qsf0i8n6lq3r/zozifur.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ml8dsoqvcfv125k9jfslbrl1ol/fevuf.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qpq4dut8cl8cqf61phr7725721/57514160225.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/a44bea9a39df69fb6db18731a9bd0cf7/37101806540.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/nedilavuf.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f231119430aaaa6adbb5908b2414f70d/wujemoxoxemasasubemomud.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/32349112013.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a821abda880---57240652300.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/48a54ab22be3d79ad9c91073f5adac8d/pimolavirogalivur.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e1689a61be3f2e71fa5663a8c906bbb3/liwasovosizopa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/bebelomoxikubefekurimu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a002fc4329f---44962740146.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/rodibawatukopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+stones+hackPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 5092 bytes
SHA-256: 6894379af216106484233b00b418187020db4fcf9969071f3f67c1d8683447d4
font_01_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 10456 bytes
SHA-256: d26da1dffcdcccb65f35b17d013f77060a3d33befb20f3ede37966fc0d9182a2