Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f973a7c44c39b8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 10:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4ae47362070b086035d76738ae54931d SHA-1: a39f7be1940a646cfa0f8c6b851c23b28bcacc92 SHA-256: 45f973a7c44c39b8b0b83216c50b57518226cd1e179cd127d8d055cf005d8186
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://vieclamday.com/userfiles/file/nerix.pdf In PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/labediruwevuwafum.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/11560431365.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b21af72c9e5---dugulepudavusaxaxarip.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1cb49a2043173dd74d94e3b4c608bd09/15434777837.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9f12457e---93503599522.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/ralanugak.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/vepupuzegoporavo.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/lufigarujuzifedemujenar.pdfIn PDF document text
    • http://33mobility.net/uploads/files/vazesawapaxudoderidibov.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf03daabc1---tageragir.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606d587ab8adb---defitimofuvinol.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2a1d3c734---xibejasor.pdfIn PDF document text
    • https://digicpictures.com/downloads/vegalerimapo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vn8th3f48pghu77nc39pc4qg17/lugodewetiwakis.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/webubekaropa.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/bozixakakurogubar.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/4f7f8nn3r3bk1ambbrbjh9s0l3/45032149956.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/17398656546.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/26fe1b19e705fd7b3d98fa3433860a39/dufazurujeremunitatadiwoz.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/newuxowa.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/q014dqnjb73dvcqshacoft78k2/95259037635.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611654777ec01---69534796449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=2004+chevrolet+aveo+repair+manual+pdfPDF 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_off0000c768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 11104 bytes
SHA-256: 9837adfeac524002e0a3990f89f78c91fecbcdc791cd77a4dcd220a3dd47755a
font_02_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 16484 bytes
SHA-256: 67e9979cc96a0dbe9a04b7acbe7badf985d2f43e18dde15485f4dae94d4cf952

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