Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f86917b0cd878cf…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 14:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f20d6531d8453c0bc737ce8db9541a4 SHA-1: 6a82ae18c42a9e625afff1bae762f8ecdb873100 SHA-256: 1f86917b0cd878cf92d1965b307a49a67ec16063dc8e7dfb6b1700fe8a90946c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://inwebjor.ru/uplcv?utm_term=budokai+tenkaichi+3+iso PDF link annotation
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130b73e1954c---lupojavedidoge.pdfIn PDF document text
    • https://gdaniec.com/upload/files/kugobidifo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161329100b7ae8---wawituweraloxedisenowosuk.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/44407370039.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/rigejoduvevofiletalelufu.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/lotozereza.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/botiz.pdfIn PDF document text
    • http://355353.ru/userfiles/file/paxupot.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/llnc6e2ocsesvhnepmc9bh47nb/zejewekafemusugabobelon.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/23985684306.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210902124346.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/rabaradopu.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/totuxuxon.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/3719005177.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/mozukutupefetalepelupa.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/47537413890.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/86922646694.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/42903305378.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/5444277472.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/gajawu.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/11243037502.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/52714667786.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9c6611b1---92262246689.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/zogubapetosofajom.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/52357113538.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161404f6b88f97---4293491250.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f8831726---76085324599.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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 19036 bytes
SHA-256: 7a545db0b61464679164e895fd08081455f57e8f3dd461bfc0099d67bb7273d6
font_01_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 10740 bytes
SHA-256: a803e1e2f5f9016e3db52965278f1669bd0ddef0c696bc8f78c04cdc5d769acf