Malicious PDF — malware analysis report

Static analysis result for SHA-256 5346256b4968e5f4…

MALICIOUS

PDF

77.8 KB Created: 2021-06-26 10:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffb1873a041c2ec55a225b4bcbee29a3 SHA-1: fe2bfd3c4aeb5c656159a56f4a6996e645b76250 SHA-256: 5346256b4968e5f4c9d82e41d5f8086e1bba676f9d02dc1783337b1150585a78
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, facilitating the redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://marljivo.hr/userfiles/file/gowizi.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/bblv2ceme9bmqpdpijlu38vaf3/13907854710.pdf
    • http://air-ned.com/uploads/files/93674512405.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/07l6hmktuq5d0bsr27fqlu4hg7/19859437881.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb0a21825---39488820362.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/67nn6b1kvkoqmof3ult0aq3sb2/monixaj.pdf
    • https://laughteronlineuniversity.com/images/upload/files/11963353579.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/5740181001.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943fd52efb4---nesavapug.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/975d9a2ec4ff3eb4c9c519f1229455e4/tugadixuzakevulubujapoj.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e431e04c4c05cc4a296aebbcdea57b6a/gaxuwasoda.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ed1e7601---68604999198.pdf
    • http://sportsgarten.com/editorData/file/5887838138.pdf
    • http://woorymart.com/userData/board/file/18518756668.pdf
    • https://condicionamentofisico.com/arquivos/file/sexubef.pdf
    • http://learnazia.com/fck/imagesfile/18883805291.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ddcf355da---80449094435.pdf
    • https://capecoralliving.com/media/file/xedunabevexovoraw.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160728f0b4e699---polorujugupaxitewug.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b72eda1ca3---melufemefajasekepup.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c26ef77fbea728335942317f6f3b2b19/rusuweriseruketobikora.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/77533338971.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/bcfdnl666gpqpbosbvh2m2l330/zeguduf.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/g90vcp6e72tbg8bt8j9i46tk45/xawovatazixenakas.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3217f8d55c---rixikedasupunedavo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=punctuation+worksheets+for+grade+2+with+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb08.bin
572611355097922af5ffb9425b399946925e7641ad3c1f26d98e2adfb95e94e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 17080 bytes
font_01_sfnt_off0000f709.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 16792 bytes
font_02_sfnt_off00010f20.bin
411d1f4511975d7cff67002222d5d98d22f2e7301adc6b432c6f639dfbe3bd77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 11252 bytes

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