Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f7aec60a607841…

MALICIOUS

PDF

66.1 KB Created: 2021-05-20 02:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02d27444145c7657e9eb5126d021bf29 SHA-1: 438834db667d9621a85645d2bc23845b0d3898e6 SHA-256: 79f7aec60a6078414e81f3c961bd01e1fdfbc8b3bca57de0ba7b574c596ad033
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The embedded document body text, though heavily corrupted, appears to be a lure related to 'Applications of definite integrals in daily life', suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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=aplicaciones+de+integrales+definidas+en+la+vida+diaria
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086510b9fd97---26663577253.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743cbc84d7a---28903654810.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a2d95e3a---57271553066.pdf
    • https://cardion.dk/gfx/fckimages/file/wiwatozolan.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc30cde44---wafijudutaweraresifojeto.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083175bdd5b6---fokavebibowo.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711b1f9dde3---25163091088.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607748e36ee7f---genotutobogejalaj.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7fd13ef040b34136e81201ea29bdde5b/murifemuxijupuvalak.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7884bd71a---25073273585.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ace3f7131132be6d27e71e473209ee20/woxigilagik.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b899487d33---naguv.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1de64094cadf55dc61be77f086864bd0/bijojazetusalubazunofiviw.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8cb0e1d1cf031db519a6c3a24e82d5c4/78777256423.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/64737809614.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/ab13ab9d672ec79056a8dcdf9669ddf4/dokegavawuzetonuwado.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840b0932cc---rumab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2a.bin
ea35f0c04559ae9f82728da4707f6fd566e553bd85bb8d7cc106cc439634141a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 5372 bytes

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