Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f18bdd8a7cb203…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 04:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 312ef4dae060ab5c1effa9c47cfe381c SHA-1: 7e79cfbef8ec2c9abd9cd52faa4ef3ef783722b3 SHA-256: 85f18bdd8a7cb203db6895edd20f21162943aa060fe1c0d5df6a9c9ced9ca8da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142892b8b615---sixibokukekat.pdf In PDF document text
    • http://ccsl.asia/files/76849884759.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/savopurijulo.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/najexosusuwogavinavul.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db39b1eecf---gujuwajolo.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/majakegifemijefi.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/mozipatufogegipedulegawu.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/86355085731.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/54638728320.pdfIn PDF document text
    • http://iviltra.lt/images/files/pavitol.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/2025621083.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021972245449327.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/zepenekoxar.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/duleta.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/kakejepatujulo.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/70651704799.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400429e220e---futinupejokeli.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/pusitiwuxuxazewos.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/memebogot.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/09/40278920649.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613080b8ac308---pixewijegosi.pdfIn PDF document text
    • https://resicolor.com/upload/files/3747321238.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/63569074409.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/fidemafulojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+mobile+crackPDF 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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 10556 bytes
SHA-256: 297ef4722e629d97238a2f7b93c42a3fe8601ce35a7451293f84f439b74508a1
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 18768 bytes
SHA-256: 0f779e0c13c476067f45750d1b1346a17d2f5bab3246467bbd3624edcc042517
font_02_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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