Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e082d408fa0cc3e…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 09:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6cc206de6b7af29d7b17313eec7ca8a2 SHA-1: 6b138244900a4b5f78559502fb44606e1242a65e SHA-256: 4e082d408fa0cc3e297eb9bde6cc9ebbe4c93c606dafdd906ee7068347cf618a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or deliver further malware. The primary function appears to be redirecting users to potentially malicious content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a6b3028d---43626572966.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bb9394ad71d3b9c9d8f87aa066c1c3fb/510914474.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/47629286270.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/monozasomidofedif.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaef8d5d42---vivexuxevotomevap.pdfIn PDF document text
    • http://fitviewer.biz/files/file/74826178760.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f2f143ba8d5457f204cb9ee62f601fda/75797773524.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/suxefozijinitiwosav.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/23442007903.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f30055ef---78127775352.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/98295349552.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cc9b41206---zawatakuzek.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/gj630rb5qs7t8a4h7gcgl7s4bn/gavukufodi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a46ba528b---nunuzijig.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d17950b42---pufenemoxuzi.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/75286709531.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/41338301342.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/mogolasol.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/6484512136.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lee6p743qb0bn09io92m6jd8vt/zixadoruzagus.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c420b1dc6ee---xaboporakikudevasuxemivo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/cb16ae62a4dbe06a0a199c23e69a25c2/96588764415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=median+income+meaningPDF 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_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 10296 bytes
SHA-256: 3dbeede337f9dcf4dc27f1c555eeee377fffb855d6d6723a13197be96966c5fe
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 17324 bytes
SHA-256: a273f69474ecc7e6a256b18438b01580fa4e92d840d2a142a9fd75c1cc4ddfd3

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