Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c308442525032b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 22:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 849fd59b25912f8a9fb337c4c04b2564 SHA-1: fbe34da4637797d9f43e244d0f4ae213cb98e864 SHA-256: b9c308442525032bbf089075bad1ab3ee6f43f93882e2a03592c8861310e1beb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e0289b248---48608827781.pdf In PDF document text
    • http://ecole-belair.com/ecole/file/gikunusebegirururibipuvi.pdfIn PDF document text
    • https://wildnaturetravel.com/File/89827811670.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/26886623173.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/nenuzojajo.pdfIn PDF document text
    • http://hasyo.net/files/file/90834203883.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/funofeza.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/65531770940.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/82214296260.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/59522866181.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/wewol.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/76816108330.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/80686089428.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d51c73f5f6168fbd754baf3fd9acefbd/rebanixul.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/92030972104.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/derunexobitukema.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/30254712759.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d7a52910c---64014452754.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614429c664f96---nepefugolot.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/28076968135.pdfIn PDF document text
    • http://stonebreaker.at/29517758240.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/31923674417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cheat+engine+clicker+heroesPDF 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_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 10632 bytes
SHA-256: c7501c7b40bc712ba42ec04d01d69f7a249bd037d2ec4390adca6bc9e06a9d0e
font_02_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 17544 bytes
SHA-256: 9f81cff0a2f07b19c706a6ad259470deae0531e5e8a14bf8f82c2deaa25e7d91