Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd743532921e164…

MALICIOUS

PDF

88.1 KB Created: 2021-08-13 05:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1550e2e217482b7a7f868c36f16bfd04 SHA-1: ded32862f5a2927b4c1e1ee2a5ac67100f276baa SHA-256: 4fd743532921e1648aff44b28c100cdb6959c3a7590f39de7143e1cd598da8bc
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 phishing or malware distribution attempt. It contains a large number of embedded URLs, many pointing to PDF files hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to lure victims to malicious content. No scripts were extracted from this sample, but the extensive use of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://queure.ru/uplcv?utm_term=spider+man+total+mayhem+apk%2Bdata+android PDF link annotation
    • http://nuocmambason.com/upload/fckimagesfile/582465443013dae5a8c8597f8d8b9b21.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/duvuxepezemuvujadogurila.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/makob.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/hnc6alm6p7a152bsiq25o4f89j/69521830880.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/fularipekolapovazunasuk.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab722f4b525---41645770218.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludejuvawoze.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/50cb61eddac6f83635cbc0e23f5c05f5/67027507065.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c2e699ec4a57d15b6017959d817d41f9/jotabanawidekagowaxupug.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/karujom.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/80999979988.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fufaforufakedex.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/59422110417.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68805effa---22222716713.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/bl3o6fda5ptf30e5cpn5hq0h6b/mizukimupudopuv.pdfIn PDF document text
    • https://rosycaffe.com/file/xinifurejozateredi.pdfIn PDF document text
    • https://fallsplat.se/file/gegulewupomogosadenuludi.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/61491844888.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa37a929620---19822006850.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160808c547fbfb---16790981533.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9274ccacf---bipuvuraguvo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c563904cd5---ludugavuzetilofejof.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/77adfc5c5ef3c4d9f7df1146500e820c/66897173717.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/84797359965.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/98470308445.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10768 bytes
SHA-256: 10b22cfa44e8ad9fc73b1d9462e714345befe3b39fa3673a12a0ce20a0dbef76
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16456 bytes
SHA-256: 4ff7164afeff50b9f5e4653a9fba332d91cc063145f532cc3fbe242ee72b7cfb
font_02_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 18536 bytes
SHA-256: b50029c2aaa9a7404121c20f80639bc65e2b1c63a3615ee80403171f9c6d4e3e
font_03_sfnt_off00013a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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