Malicious PDF — malware analysis report

Static analysis result for SHA-256 b913ce7cd7bd216e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-24 23:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a2a0d24eba4037464901250586d341ae SHA-1: a0e423ed3f181251daa6ca191c063cf668259e4d SHA-256: b913ce7cd7bd216e32959e471afaf85b6ec3f6daecc94bdff6b54ebefca02406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nomylo.ru/uplcv?utm_term=daddys+home+2+full+movie+online PDF link annotation
    • http://indianspringhomes.net/userfiles/files/57789406058.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/2526109551.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db4724eec9---64886424311.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/zasirepizivaxaluxegadeben.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/kuzipetatug.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/binok.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/29043758130.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/gidozepid.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132674eafd5e---firilokelorumedu.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/17893580833.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/bodami.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/tined.pdfIn PDF document text
    • http://stl-hk.net/userfiles/jenudogusomama.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/lekuxefuwum.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/zewesukorubezidetubagol.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/sotekajeguwasipajekadofu.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091322010934.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/7597860965.pdfIn PDF document text
    • http://rinsacars.com/files/others/rewez.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4698d23036fd88f91f3d3966f219bc98/68467528358.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/65304065370.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c73ivt3hvqpk6q7tggodfn0ol7/vebabofoleropujaranu.pdfIn PDF document text
    • 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_off0000ade2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE2 14368 bytes
SHA-256: 5b6d3fb668eeb008480ebd08d6854f7c4646d3e4811666e9025efd2b859bc986
font_01_sfnt_off0000d1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10824 bytes
SHA-256: a978283ff56bca3e5c4e5c32efa64f94a9bbc78dabc69863e7e372967d806779