Malicious PDF — malware analysis report

Static analysis result for SHA-256 0807b7493c38beb6…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 02:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f737f59150932b45648ab9f129d4a56b SHA-1: 6cd669302bdbac96fb382a59f1d6197c8d34f8fb SHA-256: 0807b7493c38beb65074c4d93a6feacdb5f58ca4b139e43519002d170435a392
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zilalcooling.com/other_files/File/bumukugerudasumex.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde987b801---3530330373.pdfIn PDF document text
    • http://toroisg.com/public/images/files/dadisamolaremo.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/nesumawo.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/kapewasidegedikatif.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/kitefoxuwuwiwololimadul.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/79312192362.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa91dd24d7---xigetilafenawigisisa.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/wakitifenasegop.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/83877452500.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/jaxepeli.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51b1e913d---53666537222.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/19091633389.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/22466896390.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/js7577a9ep2ckk8m4l0rjnr2e6/gefoxusi.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/21965429044.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/vigexezajodedoturopib.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/20528409369.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/71524280429.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/zozemap.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/naxulisuxumozene.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143afff33b6b---76904036057.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/59442483487.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cfec0da8---mixobijuwonofijukozapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wwz+apk+downloadPDF 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_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 10028 bytes
SHA-256: 8e63672697c061135785fbe9a17c6520fefb9ebf5b64d108d72a5abfb1abaaaa
font_01_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 17180 bytes
SHA-256: 21ee6f820bdaffb035b99336f8dc809b86ae8e6958dd254be0a10236d8e3b245

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