Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9808121136fda2…

MALICIOUS

PDF

116.5 KB Created: 2021-09-05 23:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d48ccf914b2823d897109408300bf5b SHA-1: 4d244ff433910caba77164c635598e53462e216f SHA-256: 7a9808121136fda2a7e2d52a8b268634095058e04e6b66c75507271dc6cf0e32
156 Risk Score

Malware Insights

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

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, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://confidenzacsapagy.hu/upload/47137439710.pdf In PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/985d6ee7e1ae03fdaa0270daf29e68b0/48517214599.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/sukore.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/kafelinunewolevaxejirub.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/78265293383.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5ebabfbac---ropuwuladoboril.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c11787dbfdb---13467529223.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5de7b8e4748a06eb266a8cd9efdf7e99/vomatazoje.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/61235730691.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/ramoja.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/68174031314.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210719_818EB27EADC2D505.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e4f8b93ea---nupowafixiziragelotutapob.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e75735da69---10674950924.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/sugikozelujozi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a4cd50d0---pazasapevipogupigazotegi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f32abe654---23159654288.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d6936846057a6da8bd66d00c1f369882/23719568635.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/33677525469.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19e70797f7---48173876168.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/lopewukewaxazefenemazuzi.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/zizefodizezugapisikeg.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/57503838306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=automatic+gearbox+manual+overridePDF 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_off000158cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CF 10932 bytes
SHA-256: abb542d309e0e21dc8fc31b49609eb93ea492dbf93ee627fa1eed9c7ac10a2fe
font_01_sfnt_off000171f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A0B 21732 bytes
SHA-256: 96210731727c0b21795b8de2530c3d6a0e51ec453809d145d790f1a43849b6c8

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