Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f61d8c2bfdcb8d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 10:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff03488fd27b1aabe0c0917dd3987579 SHA-1: 4e45865405fdd2ffa7a4be6b7b572ce76fee511b SHA-256: 02f61d8c2bfdcb8d258b0f67b8b58a988300392cb07cd08dfd467c98dc3c8daa
156 Risk Score

Malware Insights

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

The PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ozgu-yapi.com/firma/files/55405769577.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacffb13a99---gofuz.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16092c94a65ea0---ganikuravajujebozanamud.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/46205791608.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/jebozu.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202108170108447762.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/wepewuzenagaliwepo.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/kiluzenugitelub.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/36981173693.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/nikirire.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9bd512d8f1801958a9295b61a1c789fc/bewidukoxaja.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/wuwimesudapegukas.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/13192686826.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///13819796549.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075454b9ab9f---pojabalubugise.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093c65c7872b---80737224678.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/gosogakeb.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/nutilurusinofijoro.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/46bcef7c3f8d6134e13287cb192fd5d3/nevixivofipewaperani.pdfIn PDF document text
    • https://hepiran.com/cache/fck_files/file/62816645454.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/wojovitoxinuxigepik.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/fawivakijuputebapebewek.pdfIn PDF document text
    • http://yongqingtech.com/d/files/15134885950.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/97498955418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rst+in+microprocessorPDF 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 10372 bytes
SHA-256: 2e23f4f7458fd9af8ac8ae57338a34112c7a8223c8f27443d06f232e6014e454
font_01_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 18132 bytes
SHA-256: 688a21b93e48e6377ae9bc088192515e4b1d9cdeb43c03e85fe351b62ca40b30
font_02_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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