Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37bab8ae6bcd558…

MALICIOUS

PDF

89.6 KB Created: 2021-09-12 22:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49db60ea389a06c9b4d9e3109f6e8c13 SHA-1: 454a1f26af992b5216601718b3d114a2b3fde22e SHA-256: d37bab8ae6bcd5584be52d4ba12082b37bb21a86f03ee6a35d4d59d4a4f6d4d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs, many hosted on potentially disposable domains, reinforces the conclusion that this document is designed to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136b35b32738---nonizupufumepenasare.pdf In PDF document text
    • https://piphoto.tw/uploads/files/202109120750081236.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/segivikevelimilew.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/907f8d11c07ee054dc3e30d24f542c2d/rosemijefotulugel.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/38672902568.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/5599740910.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/48369922166.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/sazedasofoxuzivikabusiga.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/bijuporenisojaruma.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/54385760255.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-9/20210909150627912385.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765c7dceb1---nolas.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138551143cf9---nonovuxodu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139f900ba711---13270025751.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/lodumike.pdfIn PDF document text
    • http://elma1.ru/!upload/files/85424659058.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/diwaxajimosifixofovon.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/dedavukumopewemigede.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/o4qbttppcl3knus65s8qsbpp5n/guvanapalujo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0da192bc---32415686506.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tirade.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/jiwoxadukafeluzixowa.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/5557780073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=set+top+box+remote+control+app+for+androidPDF 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_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 10932 bytes
SHA-256: 1853f09f59239524a4e505532ceab335b2e5ea0a762126852af309ffdf09cf74
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 19540 bytes
SHA-256: 3f7d16ac4fa47e15446afcea9b583c6257da4741675370ebd483b1c2b279e3a2

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