Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64bec96d5becc61…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 03:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cbb726e0221f1fea006a6e22f2df94a SHA-1: 6de97ec3de40001752996ba819d9f12a1fa12a22 SHA-256: d64bec96d5becc61b61bdebfef4ca6d7d2e547a0ee84babb960993120d6fe2e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The presence of embedded JavaScript, flagged by heuristics, suggests the potential for further malicious actions, such as exploiting vulnerabilities or redirecting users. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://marymo.ru/uploads/files/8122148598.pdf In PDF document text
    • http://deepakbatteries.com/uploads/file/kipopusejiwasuxab.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/malunupojivigupudufom.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5517c0b70e37ee10afd031ad457fdb06/94811421563.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/lebubitokuxawawawo.pdfIn PDF document text
    • https://patc.fr/imagesfile/pubopebibafobev.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/neloxaxiz.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/wesefuxumodufuwovagakamax.pdfIn PDF document text
    • https://equinox-e.com/upload/files/82223420108.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/48142777925.pdfIn PDF document text
    • http://exima.kr/userData/board/file/77161302733.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/mefanogin.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/21101741201.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/68963638910.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d8a8652e4cf833b6304be2b97c35abf7/20283886805.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8abf0af3---libep.pdfIn PDF document text
    • http://elsped.hu/files/file/warosijasinateses.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/56166482730.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/vopax.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326863a28a5---wemajirigijivopabo.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/pagepof.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/sunujemaxujevologes.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/15066515999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=944+meaning+twin+flamePDF 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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 18096 bytes
SHA-256: 6ea50480a55544ef5a245f7033e0d9895ee73d93908d3b2b2a03ce3f9d40cbfe
font_01_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 10404 bytes
SHA-256: 7e831362d42bf015de38d4c967fb054f1326c2bd658c95a8729463b9acc6d13e
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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