Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1f124aad1d4a26…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 17:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9f657e37ae48c210c40a34ac80e26d4b SHA-1: 80878ab85b783e1f65c83223fdaf066199bb94b5 SHA-256: 7e1f124aad1d4a269dbcbcba66402b3dafd0490dbde994e4fc40f6e2c7c38dde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites hosting other PDFs. The embedded URLs, particularly those with 'utm_term' parameters suggesting SEO manipulation, aim to trick users into downloading further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/g919aud5lcfs8cu0okvem13fai/garikogafilabubavulatesof.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8f831bef---55846429523.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9ea76a55d74af545769726b73a1630d9/51249178423.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1927f85b---majorilimasel.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/66b846675105a3ed57503b241511c115/94170838858.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/77162451549.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/885646973.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/89036540430.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/likatol.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/6483036932.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/8801443223.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/kujagadobabon.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/bimukijavuji.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/75470225624.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/2361022218.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec84f2c70---rulidagukokakal.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/tuporexubak.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114bde2cf240---voxutowopedaxame.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/fogorunewuxizawinonisuz.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210714074924_2gtxxv.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/woguzujujixuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ccna+notes+free+download+pdfPDF 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_off0000c277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 17136 bytes
SHA-256: 6966f02b2f63f8e27e3a32e43ec784a2831e3d56c773a4dee1ced5fe46b4cd73
font_02_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 10640 bytes
SHA-256: 1bf4f96e47b774967666c736d2f3b01f19432a50feb4f2ebc1b4dbc1b4fd395b

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