Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b989db16231f45…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 13:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc7e42f8c22ca120c4c10dd96538ed92 SHA-1: 2782dfd1d6d94d81e5ca4c2502a1f83d7fae819c SHA-256: 40b989db16231f4583a555ec089dda1743cf675798af5550fa6206070507ee44
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7lq17qpm920afhnu0dl1ftr4t7/6531903524.pdf In PDF document text
    • https://bloomland.com/sites/bloomland.com/files/94729249191.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/10633080961.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/dp5bhvsh06np4q8jpupidfaf5f/jizukewudek.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b76685d2d---giravilejuziredelewanap.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/54202930903.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/fewovewebususadobiluwi.pdfIn PDF document text
    • https://matricula.arendic.cl/files/10492014196.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/madaxuxibokemivelo.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/65322091194.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/jenolidazupok.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132fad2b526b---45806058052.pdfIn PDF document text
    • http://partnercable.hu/files/951519226.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/komoduw.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/daxovoxilobinozakes.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/dolobateza.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/bajalogetorapurabatowuv.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gifudetawod.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/tenazovuxonituwito.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613855a31cc50---24042242826.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/84880640494.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd7cb10d7---dizaxoworiduzejesu.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/kulizaliwidajesezegiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+android+phones+below+10000+philippinesPDF 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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 17832 bytes
SHA-256: d9d81771fbbdef4f43b47436756d4d766bd3a95768399ce3f1688e48c9be5a29
font_01_sfnt_off00011831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 10940 bytes
SHA-256: fb4bdfdea88af8089c58521c4307821d87a7de78c5deac1529e7f081f083d141

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