Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8467b30c3e7c27e…

MALICIOUS

PDF

81.5 KB Created: 2021-08-25 01:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de94e17c3c74f68804aec033a52d08fd SHA-1: 1a49709732447ebb8eb27295cf7282f325706e9c SHA-256: c8467b30c3e7c27e4c80595969a5abb852f9d4cba19267dc2114de4076fc64c4
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, including those using CMS upload vulnerabilities. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://asiancfea.org/userfiles/file/32472619094.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f313f40---94452298695.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074366be140b.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f7590056---36812203020.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kibowotikorudova.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3547ab050f---jegutebogonivipodujuxif.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdfac23398---sidojilebugep.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e953285fe---nalafutefiwibuzobenokiv.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/kovolukasisoxulopag.pdfIn PDF document text
    • http://skupka23.ru/upload/m/sigikanifajiza.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/84c039a76fe98ce9bfb58236d9883c8b/24623046927.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/24117993642.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/7419476036.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/pareximaredujiw.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/tegedavukedawemujixezugu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9412dec6a---jajadegatemigubixuj.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/sitasuv.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e2d9ac4eda75eb5fb432a209819c161c/wevedifikizajol.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/15b04bf25322d4757b489dcc8cc8e026/pifewegitux.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb28d5768b---9319116299.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f2582bd778b0d7f398713a723b89510f/41837860054.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/zalipobabapatasijuzata.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/55334462099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=briggs+and+stratton+manual+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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 10700 bytes
SHA-256: 30aff8e3993f1c891ef43df3fa6f453dc0f1f72ecc8631249635fe8eb1f298ff
font_01_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 17144 bytes
SHA-256: eb4a6670da3e2d46e3a065ccabd78f184064fc3909667482d48813191f14c3c9
font_02_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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