Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0e6b02543523c8…

MALICIOUS

PDF

81.8 KB Created: 2021-08-27 20:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: af1cd2e193dd53e49a74bc97391f1c6d SHA-1: b887aae6dfe8a9da1d293f11ab9da963306a1d78 SHA-256: 0e0e6b02543523c8d9a67b32fc422b4ae90b701d50838074e4fc9fdb00f97372
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns strongly suggest a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://queure.ru/uplcv?utm_term=call+of+cthulhu+rpg+1st+edition+pdf PDF link annotation
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7d331dabc1854e4af1828efdd9f5cc71/rukirutuve.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/felumodojumedukax.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608952387dcd9---gogijobowomirutuvegub.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/sukidafo.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/5o9aep85uej8papv48nl95ne5p/jixonegexovokemudu.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/47361178794.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6d02229c935a9a88fd50d0370f6bf0c5/2947163386.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/pokiku.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/533c64f5baa87d3face28dc1e95b7157/sexevegiparujukuked.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/fb947dce431ea08b09daab22d21650c7/49890549267.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/kojowapazes.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/lobalunetuvewo.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/85572077919.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710fb586aa5---sigolovufozamuzad.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089329a411c0---90745816999.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210821014830.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/41e8f306ee00924afebce57fa21a1ff1/dusuwozu.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jokevudanaguzer.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/maponirobawugilibux.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/judofutorud.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2c26c00bd67687f205d75b540eafe0d8/xewefedexuxu.pdfIn PDF document text
    • http://chipgene.com/image/files/20210815_123452.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/kudijiditezotesituxox.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/zetogebuzurefiju.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/malotofekinijigalowanuni.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16087605db794c---50656841164.pdfIn PDF document text
    • https://lapdonline.org/file/matanisimakofalizon.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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 17280 bytes
SHA-256: 392db23542a92b4f1d65492832fef48889863c851629970232bf02e8be7118fd
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 11084 bytes
SHA-256: c137c2ab315887e6637db71737c00235ee52066438c2d1f124707efcea86e3f3

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