Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ffa150de657622…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 01:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a416c7e7217896f40f82371862975aab SHA-1: 9f272171a38eb0a5505342b40b14ecee65f64cbb SHA-256: 72ffa150de6576224a3453f700661ddad907dada8c1bd7767ad22875d27c92af
176 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Multiple heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of an IP address literal in a URI further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://carmakers.cz/userfiles/files/75541341424.pdf In PDF document text
    • http://voszveszprem.hu/_user/file/94574677414.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/73991197667.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/jogedewimoxixemufuwimevuv.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/kekowoz.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/65318542288.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/kezikexexalatituzivuworag.pdfIn PDF document text
    • http://kco.su/userfiles/file/65678653465.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/zuwewuvesisamaresawi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ec75882d0a2c37104ee01f6c951add16/xajajotudifodogexax.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/13657884086.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/sovokamomuloguremoxuwiw.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f57b5f126---31178183749.pdfIn PDF document text
    • https://lecachet.fr/docs/files/safux.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16130993e3c468---latodapos.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/79404941493.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/vofajekegakazaru.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/bitilodupezapuxezig.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/vunagisisox.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931b0b5d27---fesuw.pdfPDF link annotation
    • http://kurier48.pl/files/userfiles/file/87577429558.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130544b32709---5309161228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+read+file+from+internal+storage+in+androidPDF 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_off0000bad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 16252 bytes
SHA-256: b93c9b35bee078d75bfb668e5cd8456746a16dc2aaa0f4bed5fc3875543886f4
font_02_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 10772 bytes
SHA-256: f26534768f469af2dafed06d7b9680dab7b60f5069214b63081849065476881b

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