Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd4b368362b61fb…

MALICIOUS

PDF

93.0 KB Created: 2021-09-07 19:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2756f7bb181afbd53870a6b071253ef3 SHA-1: b9190f736f1421062ebcf19a9d0bc9ce7f3c56b4 SHA-256: ecd4b368362b61fbdefadfd6ec6c216e2c28f622fe516cc8aabee16f8ad60be1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=scary+stories+to+tell+in+the+dark+pdf+download+free PDF link annotation
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/efc4e83449b8dddd9c61a61ed4b7421e/53805012882.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/27074145859.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/33178180766.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5bbe8fad9---nifexesotetatine.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a13a962907---28389278460.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9618d298---38568287436.pdfIn PDF document text
    • http://zerosquareonline.com/file/mefufakemaxaxomonoxozok.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5ca6e54ff496fa5a348b40ef29428df8/92580243909.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210627_031232.pdfIn PDF document text
    • http://mcutech.net/files/94358465453.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d43ad2987---93093117494.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/51348256442.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/u1vuj1jg17mhe4br3ra7boi8at/30454328466.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/xozomalelufilotap.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306ee767477---69260304752.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/6599229d79104c97cb662a08e8e618de/4988409031.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/62134255fcabc6af1b6183fab8ddbdc7/15460634104.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/16384206740.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/51834109015.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d66014f3---19417153010.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/palebavinumowuwiw.pdfIn PDF document text
    • http://ibb-online.ru/f/file/karakarosawejazelom.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/18022630864.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_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 11084 bytes
SHA-256: 18fd511f2bbdc08f8df10bf874f9e1e0f47585b4a8a9cc2627e6d0a270ad0328
font_01_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 19900 bytes
SHA-256: 0a477e47bdbf52ae7392197b0e5dd028b14a96e36320373db3c75630afcbd960
font_02_sfnt_off00014df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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