Malicious PDF — malware analysis report

Static analysis result for SHA-256 84913868a1bdd96a…

MALICIOUS

PDF

86.0 KB Created: 2021-07-16 22:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f50559f04f182273acbc5e9b10af577d SHA-1: 96182cb606dbb6433cad8007037158b42890f924 SHA-256: 84913868a1bdd96a7be1a5c4d9570686622eee24fbc08aaed415e598a54db054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious content or phishing pages, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158b40c20e---dowuwuxojewido.pdf In PDF document text
    • https://tavcam.com/upload/ckfinder/files/16000002901.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4090456e48cbccdf46ed9190ec39d568/14393612891.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/lugolopuzis.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d7be085a1be113c4bb3b72267a7a19e1/davojuvovulidum.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/32979961129.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d15e71f3---lininusoxa.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ae5pa8fkmpcrqhtef5lo6hlee5/86533553729.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/97699830893.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160983e84d145e---41125782682.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/86254112792.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7615d6bae---61173636906.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/72943375247.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/95403427568.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/didebezuvufumasorovamoj.pdfIn PDF document text
    • https://kham.vn/userfiles/file/49674451012.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f6cec9520732db730cacb47cce01d044/renitupudajewerolexa.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/15946164118.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210708_064b6.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6821b82a86f706e0c9a3549a2689aafc/fumegixogejela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=online+web+games+for+pcPDF 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_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 17168 bytes
SHA-256: 99449989742f5c3565c7ba8b292778ee057c20149c90acec67eec0cebddba0c5
font_02_sfnt_off000131a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 10976 bytes
SHA-256: c0e017bb9b1379fc08c1fdf05e4d64a5f353966baf9daf02e6d767d068431f06

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