Malicious PDF — malware analysis report

Static analysis result for SHA-256 282cf51773278321…

MALICIOUS

PDF

79.0 KB Created: 2021-10-05 06:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 017487e44fe9501e44a2f703aab4a2f0 SHA-1: c2e02e318cc4d309f070efa62bbe8ca13afb9de8 SHA-256: 282cf517732783217792a6ff3d91b69c87ac56ab10901ee73d109f9d665f53e4
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://tahubunting1.com/contents/files/tunududaxefawufenux.pdf In PDF document text
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/38410184528.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf1e2d7e9c---jeziguwitefojazasefabuzu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415c0e63b16---31814376432.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8174d8ada5d67708d64ec7a71c60044/94080951546.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/34715820676.pdfIn PDF document text
    • http://clerus.hu/files/file/26216379609.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/relunopikosatirazapiloxu.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/guletixurojajobes.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/83874734540.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/nugisig.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210925_161935.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/gekagokejip.pdfIn PDF document text
    • http://exim5.hu/_user/file/texekagit.pdfIn PDF document text
    • http://space-edge.com/upload/files/73322790763.pdfIn PDF document text
    • https://2acontractor.it/images/file/79289303476.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109290749474287.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/fenewuseje.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161370e70ed43e---lokuwun.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/xetekafadiz.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/xifenuzotujevosuzimete.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/99618181145.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/refiduzesakegatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=difference+between+osmosis+and+diffusion+class+9PDF 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_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 17116 bytes
SHA-256: da1c5c4b78ece17e42711151e5501255bf954411414845f0e2ddc779a83f5bdc
font_01_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 11132 bytes
SHA-256: a5bea75cc95a183c51168f06949909e00af7edfde68ce02e9ad094aaf475bd4f

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