Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e29581c396bcf80…

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 08:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6556c2d67c04cea1bdaa18b536f22145 SHA-1: 9cf406072fd6e88c8f75b80c74c37e28d11ba3f3 SHA-256: 9e29581c396bcf809061232a973b7c5db2e5e21ce6836fda0acd9afc4acfaffc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be directing users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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
  • 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://smidgel.ru/uplcv?utm_term=como+aprender+a+tocar+viol%C3%A3o+pdf PDF link annotation
    • https://aihr-iadh.org/uploads/FCK_files/file/60005190081.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/rafaworerurinuzagokanora.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/1402a14ea8522416d4086f69b48a292f/33623857134.pdfIn PDF document text
    • http://screen.by/images/file/kidizinexofuravawujuv.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/84fa4f73af7eb79f8d7d7ea624da5483/57257664362.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/48085013741.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/sanazimebeguxanebitekom.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b8b05f9e---dobugu.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/muxipatovu.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/95529694578.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/35844955269.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10662009135.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7099bef4475aea8513a0ddb2a19be91f/25020159020.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/mojorodulusebegedapow.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b5c917f7f89a855651df1688335e52e5/nekuxikolobupavurumi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/78992046817.pdfIn PDF document text
    • http://samtle.net/ckupload/files/96105247165.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ed65840d---xokidijononap.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ba43660d2---xuninewok.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16123615d6010e---50500860699.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/junalivewasejepiravidu.pdfIn PDF document text
    • https://beaszemin.com/files/gofogazavoletesik.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vhv17hfvccg6j6m9nrs811oh9a/bopizelanularebivokonel.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/xivimirapedarejukiletu.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/vulazunizadewipujipebop.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/92ee43ef9beec90a5b8573f22fd2e2bc/reter.pdfIn PDF document text
    • 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_off0000b738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 16408 bytes
SHA-256: dcae054c11cc5f5268c9a8a7d54dff0c7d178b9920d66eb2abdbe1ef24602ce6
font_02_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 10976 bytes
SHA-256: 6dc48fb612bbb2a79e2cb9ec1388f059066da7c38cae2f04998f41d0bae75b80

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