Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34e4bcb4db7ee51…

MALICIOUS

PDF

71.9 KB Created: 2021-09-20 12:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa33492dd9bf151be83059dddf4d28c7 SHA-1: 583955487ec6c156820f7b482beaaa358882c465 SHA-256: f34e4bcb4db7ee51bc9c28025bcbb02da977d9baedc53353b0492703e7fbdc27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to external websites, many of which are also PDFs. This behavior is indicative of a link farm designed to redirect users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://irlanc.ru/uplcv?utm_term=minecraft+pocket+edition+2012 PDF link annotation
    • http://bensonlandscape.com/editorData/file/50227819480.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd2e5de3d---daboxeken.pdfIn PDF document text
    • http://mdtrend.hu/files/file/53788885634.pdfIn PDF document text
    • http://lagrupacio.cat/file/62758477.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/7624344474.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/taxazavim.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/sapaxamor.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/siwapopuwogebaxuzijowefux.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/fuvibeluposakanemeditej.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/xogosobigufedogovenomaz.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/77889853062.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/nubuwinivigedonumem.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/novugajimiwurogu.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/rixezuzivowi.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/talokoxufujunaninav.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fc5594d0f---satexuwadewubobi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4c53d3600ed71aeb65f5cb057bedfc5a/44766492848.pdfIn PDF document text
    • http://riph.pl/userfiles/file/legejabaja.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/tuluzab.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/vuxadusakawubinub.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/90423785214.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/vofapuxini.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/mepejavube.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/rikaralajesuzamofo.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/3370763923.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/56851965715.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_off0000b714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB714 16312 bytes
SHA-256: dc5111db8f2f364f3a477bf875715d6278cb513f2db0c5fdcfabdb4268df73cf
font_01_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 10780 bytes
SHA-256: facc250a430b8f0682baf7196bd777aa5fc2526268f63253cdc69026b8604547
font_02_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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