Malicious PDF — malware analysis report

Static analysis result for SHA-256 244627143618d069…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 11:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cd0056d93ef45011a2800aa4cfb430b SHA-1: a3d3cb66d0ea1f808b2434329328486c04596097 SHA-256: 244627143618d06979b7ebbb19a933b93a58ec2cbe109369af2e692a35fb67ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF viewers or redirecting users. It also functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rustproofingottawa.com/userfiles/file/13324059417.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/10657914221.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/89607069428.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613617cf87eaf---ziledaju.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/73422806459.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/zilabodif.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/raxewusikafipinak.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/nifedofakugirow.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/21033652802.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/wowemizivelazabereju.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/546207649.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323b55f3b11---49785795424.pdfIn PDF document text
    • https://masukpt1.com/contents/files/jakoxegazajige.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/970437120.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/xipuj.pdfIn PDF document text
    • http://banquat.com/userfiles/files/1308338998.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/66937719918.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuluz.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/60796537191.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevudedel.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/26316170629.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/50h2p5oprecng3u22mdqrdvi73/joluvusuwi.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/89158646297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=easy+roulette+geometry+dashPDF 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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 10696 bytes
SHA-256: 4ca1a59432e3313a6c5f1f79d2f9581ed37f52d555c6f85434b608dc1f4267a0
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 17700 bytes
SHA-256: 229c588c1e927f29d9dd29cb2c1569826feaaf907906e43cb497449a979cc21f
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1