Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32b42d5832af6bd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 06:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c49de5248a4543e798301fb8e3ddc641 SHA-1: 1340d3679812e85bd3036e2add5be59d3ee2f7cd SHA-256: b32b42d5832af6bd9f16f16be1e2a08ea4dd379f8268fcb2d4bae024af9a46f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The presence of embedded URLs and the structure suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=chemistry+ionic+equations+worksheet PDF link annotation
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/94477b77d6baa47e1586c1c24e0d3ac0/paxajitoxa.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/malimobasufanifo.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09ff97a8c0---bogizusataropubanomawe.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/sesikolaxox.pdfIn PDF document text
    • http://france-ex.com/wipaseg.pdfIn PDF document text
    • https://alutat.com/data/file/40067811122.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xefoduzobevubusaxuluwijas.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/xolajakodedamomulenup.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/jagelizemokefifusinepo.pdfIn PDF document text
    • http://candientuvibra.com/images/file/17263150048.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c627959d4---xiwugotenin.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/49820679558.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/xixafimil.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/vekogipat.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/36614098990.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5e785579---litonuguwavomasetupow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd329e6be---71376711586.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/p7k93nomeq34101bvvk975dm96/28055751566.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/50863544661.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/momojakonazolupizutit.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/57554244615.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee66eeb5c---44495331651.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/kajewurige.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdfIn PDF document text
    • 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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 11016 bytes
SHA-256: 1ce518817b004a7934f836ddfc08a034f7200ff9ff094143d7e9bf85921ece59
font_02_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 18180 bytes
SHA-256: 1226f83eed4f041a414db0657bd55ad6d769ca4bc4ff4a00866b227120c0c499

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