Malicious PDF — malware analysis report

Static analysis result for SHA-256 81da06d8fb488d96…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 19:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07ba87eae4d5cd3d0207eda2b07b2a96 SHA-1: 89756b9bae02a1dcf69e564c8efd13380d2014f8 SHA-256: 81da06d8fb488d96050287ac8f5d4a8783ed225ac587754d4170a08faa57ab4b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://bluebossa.pl/files/file/89909914846.pdf In PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/79377280118.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d8fa8180---komevafagusepoxes.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/81352614786.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/lokirox.pdfIn PDF document text
    • http://santeh.md/img/files/bikav.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/gigironefafogevanulitoxiz.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/nimiwapatepokevizalo.pdfIn PDF document text
    • http://naviway.su/upload/files/95174629779.pdfIn PDF document text
    • http://wixoon.hu/upload/file/tuwixutuwakukofefi.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/40912808138.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/larabadivi.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_124340.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614450c1895ee---zakibivusemukagozokoxo.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/34016710854.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/29453876718.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389dd65748---tobujajipe.pdfIn PDF document text
    • http://xhzhengli.com/upload/liririjisenikoser.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090705012273499.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/27c65faad5185e8696a6fb1bf8d15d61/31379165705.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/givibulutotezumazako.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/13881223722.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/kazufo.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/79434276499.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/kiwotesax.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/miroxi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161356171cfdb1---sarazo.pdfIn PDF document text
    • https://recrut.com/files/files/25948115221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+restore+deleted+messages+in+android+phonePDF 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_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 18380 bytes
SHA-256: 922ec4115cc1833e7b51d73079787023cedbfdcb35138d86eb66aca2db973158
font_01_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 10916 bytes
SHA-256: 97e3b7cc7d0b55824519b7dacb918cc328f6375047bab2858c3af2eb15489bc3
font_02_sfnt_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.