Malicious PDF — malware analysis report

Static analysis result for SHA-256 276ccdd7ba9512b1…

MALICIOUS

PDF

122.2 KB Created: 2021-07-24 03:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6479ef7d84bcad815cfe070bd3d2372c SHA-1: 45d16a7ff0f51bcabce0723190303240af0a7a76 SHA-256: 276ccdd7ba9512b1f2ae2cd7cec6c81b7e28249a5d5ed2d900163d57f2b4a119
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. This suggests an attempt to distribute malicious content or conduct phishing by leveraging these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/380d658800588fdff00f4261bcfbfcc4/malizufowonuwenave.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/58040303823.pdfIn PDF document text
    • https://petala.gr/userfiles/file/16503612877.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0356f3c1b---bopixonikonanedevifisow.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bfqb9rsdc5r8c0ncvht2a727ro/41213935291.pdfIn PDF document text
    • http://asustainable.com/global/file/88169734649.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/754b34rv0g643nscjk3dvvp5d2/benameritojewupamab.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rrivul2nbh3u2ju18ad3t2a4b1/40915553646.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1a297323---guruzufedomoji.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae8a42a4a---jewupebilobesi.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/sipazexivakadugeloseka.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/62dedd203e81516168c2f7411df9742e/47843109499.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607897d86f9ee---vusigutejusojepotub.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/50187016272.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607156bba927e---36590422315.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8faa337b---woxaxinojekefajakugejun.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fulegijuxabo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa543f5403f---69429446395.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/varunoxozem.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607062a18d404---25169381839.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/tm69reuve6g75rrnc9pje3hl5c/koroje.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/23863995160c2a34d87c86.pdfIn PDF document text
    • https://led7.ru/file/vakirufituvevitolotun.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/op6nra5uv6jj7mjsiulvlih42r/50211083138.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/rulekupasaxuwupewar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=characteristics+of+postmodernism+poetryPDF 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_off00017aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AAC 10984 bytes
SHA-256: 95601c897624ea05890abad89d613ec0f350cd62a99a1a2538bee6c0aa501191
font_01_sfnt_off00019410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19410 17440 bytes
SHA-256: 94b7c684a7cf1dd28bcf8ca8325f3d9ab0515abf528fe0cc4935743bf412f87f
font_02_sfnt_off0001c1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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