Malicious PDF — malware analysis report

Static analysis result for SHA-256 280e9c72f8f41d13…

MALICIOUS

PDF

96.2 KB Created: 2021-07-13 15:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 185f497fb313a180db41e3855e78569e SHA-1: 5a0143425f242f38b7321c2151bda8bb7a534734 SHA-256: 280e9c72f8f41d137ab4d350d8acc47becafab30c6a62c3c838c7b744666c4c1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content. Heuristics indicate the PDF is a link farm on disposable hosting and that it is a phishing trojan, aligning with the observed malicious URLs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67838f1b3a---67833932591.pdf In PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/lebawaxoraxopujekonubodas.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/43565444260.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/19295712525.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/fe1acf74bf52f99fc4f54b915a92b813/38340820202.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e10c3be4bbf---desekamusapisenolesofir.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9536b744cd124d868f1f2472668814c1/38276199759.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c283ef0f9---39525183788.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/nuzoluzivologozomizod.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/wubukulanaxek.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087aad8a3ff3---72799527480.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mumegifobeles.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db2d585191---tokuzodinibuxudek.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/rizabosukapugixukavitu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/898615e01fefda8373e3e9442f656c77/petozovimox.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gawawupo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/mhrfdeemivi47qdduev81hn3r0/79470545726.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/romopalijeneliwijulej.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4565b71b5c---29867839071.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/xoziduribejajakajepevaja.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2vmkgf3l7u2ajnog4skinco1ek/55135262949.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/41566a8c28e487aaf39b3376032486f3/7799421843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=middle+eastern+grocery+storePDF 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_off00011827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11827 10652 bytes
SHA-256: 4c3792c5612ef9ffd725d2b7a7cb537669d6fef297b1a5343ff8f91325776911
font_01_sfnt_off00013070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 16648 bytes
SHA-256: 7551b8cbac65e1d9c9a8326eb89651b5ec04f8ff645c83a1f04cbecaa70fc087
font_02_sfnt_off00015b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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