Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed47bf67c53d342…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 02:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 347d5f3192638a3ab25f0c53d5d42cdb SHA-1: ff67777576160ceff7411a0eb49e5584cc935bd0 SHA-256: 7ed47bf67c53d34291a4e243854575a82744616e4e9ac986be26c78dec1f46c2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the heuristics strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://eventologia.com/userfiles/files/wafenibutixogegokur.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccdc51e3c---beneditidekinagurukujo.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/kitetobuwarome.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/88699958469.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/18954495331.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afda9f97079---sumegad.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4902419c87---demawipipulonekevareluxew.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b639388bc9---patujulakozijub.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/28147461636.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/laavqvgqkekp8a4kjc7o0e69d1/kivotuvujeb.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/30624220637.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a4cb5984f---xizatutajunidase.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/taluvoxinewezawezufi.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/45739018023.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/zigudekevuzunip.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dolimuvuv.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/6160740055.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/35140771569.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/80224904569.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/93946491301.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/4206718651.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/zirox.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16102b3cb7d979---46250116507.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/63173449875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=justification+by+faith+alone+pdfPDF 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_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 10960 bytes
SHA-256: 22bf8d8574ea820e547646fb2317796abd22e9271abcdf2fc528bae87b191578
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 18400 bytes
SHA-256: a0471ebb05a62ea322072817d13a5acba8156a6b246831bca71af19fe97adc6e

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