Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edd20ac35133f6f…

MALICIOUS

PDF

72.9 KB Created: 2021-08-28 10:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a5ea0c8ecec8cf128c206c95f9c62d7a SHA-1: af654146ad782dc02a0a0d87a204e750f1360dbb SHA-256: 4edd20ac35133f6fe1a84438017716157dd770fdd689a454778c4e741e5f8e85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lure users to external sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc58aa380fd---57479535094.pdf In PDF document text
    • https://gulf-rope.com/images/bulk_images/files/pibilelugifuw.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf84aba25---98556968345.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/wobabe.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/87036229922.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/gipamizuko.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/dozudurujaxofurusume.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082657ab7d4f---fimesogagijixuwaji.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/tesobefoguva.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/67e89deed19dee40c70b81ff4faa20fe/mobalazaparufakexufinino.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/sudalefoxuz.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/75321669191.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67406703176.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ji62h4mi9mf3gr6i3tabkd678n/misipanen.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/39a90a71d267ba8034f7967c4f672bc9/kumoxuleraw.pdfIn PDF document text
    • http://safarang.com/basefile/files/lupiselemaziguronivu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e1c27824---rasubomawonomaruxomod.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/degejadabavekejixaget.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/gulezegunaze.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/lemomivolatidovo.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a7bae786---40378897675.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/i3327pffu4s61qdg0n3ok9v4ht/gazabikizoluba.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/delego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sgn+to+pqcPDF 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_off0000bee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE1 15976 bytes
SHA-256: 93d407b79244c6c90b1a3f30ec4e2727440398bf06ad4d3c1ca68c1f2038f9cd
font_01_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10072 bytes
SHA-256: 4d65933f97ce15227bf0a580afea7e738f5b1f84e00d37e83e11fe9c37268e57

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