Malicious PDF — malware analysis report

Static analysis result for SHA-256 4916d07b7fdbb935…

MALICIOUS

PDF

91.9 KB Created: 2021-09-06 13:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 839238240084557a9ce0ce5b43c99d4a SHA-1: 20004f941cd607673159ff1dad49fff6dec91706 SHA-256: 4916d07b7fdbb935cf2d0fd3483db173cfcd6b800a1a47db8881feb0219e22e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload directories or hosted on disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853e03019ac---52197414283.pdf In PDF document text
    • http://partnerplus30.ru/images/fornews/files/49004601249.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/wanolegize.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/99570310734.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/mezopejaxada.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883946926dc.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/neranilodaxejabajofupabe.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/bajivakojuda.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/zewatig.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/24159552170.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/dcb9b958da0e61d49dfa69e549245931/18462024591.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/lipukizoneregegukego.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/pavojakamebotopoko.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9f692dcd---48797444669.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/fezedomazunejel.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/76517629014.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/40748242926.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/vqfvv1dt2s7r7a1e6pu2cen585/sibuwemi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/323bd5d34fc44539b2af1ef7c3632dc3/xuxebuzi.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/49948167148.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4glot0tdb8vr9ivlfjegsdojg1/xarefelumapeke.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/e4m027nmphuaugcoovqm27n5e2/19088194401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=importance+of+knowledge+in+islam+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_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 11092 bytes
SHA-256: 41000fe5a00dd3d6fc71ddd1f0b65efe42769c97e7cb95dc035c2dcf92baafe9
font_02_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 23360 bytes
SHA-256: b96621b13aea873c88150c3c747d9aa2e18ed4c5588e9dc36b56fa9c995f01fc

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