Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcf7bb016157c43…

MALICIOUS

PDF

121.1 KB Created: 2021-08-08 21:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4cb27cba34fa800f3e3d7ee764642d17 SHA-1: 2b31f901624bd860d634e6140e6be9067c602abf SHA-256: efcf7bb016157c43d53316822ad58f5a35b263b13bae6b25d6cf72447d9a6d67
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The ML classifier also indicated a high probability of maliciousness. The document body appears to be malformed or encrypted, preventing analysis of its direct content, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://garglob.ru/uplcv?utm_term=understanding+evolution+homology+and+analogy+answers PDF link annotation
    • https://espaciocultivarte.com/ckfinder/userfiles/files/dabamovukowa.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/poruteretemif.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/jamasanukikenux.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/buxupofifivikorafejonub.pdfIn PDF document text
    • http://wenxuezj.com/images/File/17822346067.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622538188.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/729746ac55c29c0375f7c581722f0732/finupenivufonetanekubenil.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9c808ba71f2d20796b068cd9a8ebaac5/xavejagupumu.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/25434977546.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/36721758598.pdfIn PDF document text
    • http://www.bandungmesin.com/file/90807700131.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/nedugimakukebuxif.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/51776036139.pdfIn PDF document text
    • http://strap.sk/uploads/files/23465869237.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab872f7e26e---zesejumebuxizotoz.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/74699727421.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738d6913f00---nejowosomepalabatobulizul.pdfIn PDF document text
    • http://email-database.info/userfiles/file/7911184217.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47b7ba9fc1---tutadubipefuj.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1unv9uflsn52jqn8elng9iu902/24789495361.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/teliwepoxemuserufiv.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/066vpofdpgd4ns4pnv3qv1sfc1/99322713162.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/76083031784.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c5d684e7---47014094276.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f8c88c3be---boketuronipawamuriwuzetu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/65318ebca1cbb752bb8e906126b5bcdf/lemoruselabudipemuli.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_off00017237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17237 19264 bytes
SHA-256: 2fabdb0fd9b9d763ab25564dabff02cdfe282df0824c9923d36251b5fec818f6
font_01_sfnt_off0001a37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB94 11068 bytes
SHA-256: 94b0a32e7e2b749383a6525742ffd3c2cd192fada9440662d64949a48f00f745

Open this report in the interactive analyzer, or submit your own file for analysis.