Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a963a5f76eb6de3…

MALICIOUS

PDF

81.7 KB Created: 2021-06-29 21:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: a3ec04ddb526248cbbd4147d08fadc09 SHA-1: dca2ffc771cdfab5bb1014f578ee41e751619e39 SHA-256: 8a963a5f76eb6de3c3a20c30e8c95822eacfbc5637cc0f3abd410f4878ea9072
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links, many of which point to compromised WordPress sites. These links are designed to host and distribute further malicious content, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. The presence of these links suggests an attempt to redirect users to malicious downloads, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4045

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91635e4ae---59970285624.pdf In PDF document text
    • http://rotarylaspalmas.org/documentos/file/75338547464.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/sudanigeruj.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4fa2d0d6ae40969b514bc1ae8d816a51/bugamawukobi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd317e9cf3---60313179848.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/93550947948.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/vijikiruwota.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ffcbdb97---sinosub.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/87668091128.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b86q1lf93fniol549utg2836u5/rileselupomewilamuw.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/57298080760.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/memurefibiv.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qfvlm3pv6fk9k3egjsige8h7p0/71269652408.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072196e89009---jikasuwejakolaxipinizu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e2a94f72a5b05fc23e832ed70e734407/27015487154.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd86a42c304---86709618232.pdfIn PDF document text
    • http://metallpress.info/files/98120240338.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f133115de6---52474421684.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/botopilonax.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160906627b5e58---57552561738.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035d5bcff7---zepobadamosal.pdfIn PDF document text
    • https://kermanrooz.com/img/files/44815971139.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/n0bomimce3bu4e5ggn6igbf1dp/20531944603.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160896355cf2a3---71163995745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=treacher+collins+syndrome+for+kidsPDF link annotation
    • 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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16852 bytes
SHA-256: 2edb0d98f3a4dc7663d37d4cd8905cfa9c97d1fe1509df2d2b089f7128f8712d
font_01_sfnt_off0001187e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187E 10812 bytes
SHA-256: ad3057887b1cdaae179f0a7d97c954210eb44b9904f7c07d52090e7a60131dbe
font_02_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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