Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7118ec08b1b0c0…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 06:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 793826e117d0ead648bacce59d4e462e SHA-1: e879760888ec6420e8d73b847eb58e5643eb0b12 SHA-256: 5a7118ec08b1b0c06cdf97ae0b0e2eda25517d656d8ab0895688aa607767c969
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to these external URLs, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://agrilaui.com/userfiles/file/ruvugeluvinexefujewuraf.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b538b8892---wibunabigifozinofokonasot.pdfIn PDF document text
    • http://momsystem.ru/public/file/33659006642.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/scdedsiklligqe6e5bdd9qqo86/xatikukim.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/23530283874.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cf1af59d429875631af92390f3965c5b/pisezuluvaxewefefa.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa591e5d027---zuvamifajebi.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/46016728407.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ec633b80b738b58bbb91b9b0f8d92a6c/jedinipalibokumimi.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/penupubutewuxobojapadage.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/rijalogodenomesipoju.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/3053968d38ae07accc3552b5ae43fa0a/nuwitijolazogosudeliris.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/jexexupolapaxuwujesuxo.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7e36ea0e2953106dac6476f45c7df177/tugani.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/753b5b74ff5d8ee608d58524ce196987/xerowo.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3ccdb5bda6ddd8d3f5e998ac2c2c217e/xosojivelijirudezegewa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099e24ed9b84---24703782329.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/fc5e5d5828c46b2ba7ad3170ba7e9ef1/63366308396.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/f07i839rdgml720g52dvhr5u8e/56346754082.pdfIn PDF document text
    • https://rajaunited.com/contents//files/tiruxuzafizudosap.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55611da9a---42208245721.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708e1e4f2eb---54735798338.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/lapuweraxovivimakiwun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ovulation+with+blocked+fallopian+tubesPDF 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_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 16960 bytes
SHA-256: c0fbe06390b1f3b5cbf0efdd6f9963396abc72c16418157eaa6fc68e64dd59ca
font_01_sfnt_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 11124 bytes
SHA-256: 3a3e3ac3d9b0f7b3279c8719616e9e8f28bd4608d7fdf81a859259df41999071
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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