Malicious PDF — malware analysis report

Static analysis result for SHA-256 0526b09df1fa0030…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 00:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ce1e970200ac4388f5c29d14a18691b SHA-1: 7dfcb61d4fbc0fc7bc73e1e81d100eb253a1db75 SHA-256: 0526b09df1fa0030ba156b30e621ef5db621fd8813efd4ab14ec967916d7345b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs, many hosted on compromised WordPress sites. This suggests the document is designed to redirect users to potentially malicious or phishing sites, likely as part of a broader distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/652669ce5d0f0276ee9ef5ef680c31a9/30384834589.pdf In PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f9748301b67d18153178b05b8852d4c2/nodafopi.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/57162791669.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/1064890486.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/rusikisebuz.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodemalimonepenipolop.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/39386513512.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d2f6fd4b015d3c837d00a789ab60a62b/dimukitejatan.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb013a71c---bugemudokavujibumefajape.pdfIn PDF document text
    • http://www.siposferenc.hu/html/keradosakosobe.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/2vbrdh0qtql1vpuco6gpqku6ha/likumef.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/kegix.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf268d86c0---74151146797.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfbec8c8b7---gaxoxon.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/wevep.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/d301b06cb341f992328dffd5c66a4aed/gofenizuje.pdfIn PDF document text
    • https://andrejc.si/files/file/71354419899.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/7245566002.pdfIn PDF document text
    • http://premo.at/userfiles/file/10026573128.pdfIn PDF document text
    • http://web5gstore.com/Files/files/34700604322.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b67c7d7aa87e99acb54d20daec15766f/84408171896.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/rijatuli.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/1800104370.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/runivawanufozal.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/tosagejonebegagugug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=language+learning+strategies+what+every+teacher+should+know+oxford+pdfPDF 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_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 11416 bytes
SHA-256: 209ddf00e409f9081a3de406ead01d625b1f4bb58439f6bb35be2b1db0ca3712
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 17880 bytes
SHA-256: 0e515b18e3e5ddb5f554265a7ca7bee7ab446aa3114ae3cbffd8e535a30e6b87
font_02_sfnt_off0001288d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1