Malicious PDF — malware analysis report

Static analysis result for SHA-256 027d50b8742ee8e9…

MALICIOUS

PDF

74.3 KB Created: 2021-09-29 06:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ecb885ac96dbf830a5e4ba7d928e997 SHA-1: 6e9077fddf70a4bd65ded9b143f5b7b08a61aaae SHA-256: 027d50b8742ee8e946308e35ac64f72d7342b6447bb2022f4420dcc5719d9aa8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or hosting malicious content. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/siwuxadoxi.pdf In PDF document text
    • http://fecoil.com/userfiles/file/xirixixudaki.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/zegiba.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210920/file/41199843791.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/27358951562.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/merewibanut.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/firasovorojisukametidaw.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/17099449358.pdfIn PDF document text
    • http://domuran.pl/files/file/nozovibegajuxizap.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/zodofugefodamed.pdfIn PDF document text
    • http://adriennemason.com/assets/files/5689012104.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/figuduwizavu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613387b710d17---divadejejeranekutot.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba5736428f---wokelilonazakagu.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/zewejodebodalipelurokefaf.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614651ccd35d7---nulopimivaligusap.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/wumewibupi.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/lupupexuvan.pdfIn PDF document text
    • http://bankerz.in/qpic/files/32634102550.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/nasedi.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/48168595007.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/96055009552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=zip+code+bay+lagunaPDF 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_off0000b8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F0 10640 bytes
SHA-256: fb554bbba55abd60a0cf6915f69e69fdfd8952851ff1d63180add4994d6c8a53
font_01_sfnt_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 19608 bytes
SHA-256: e56eb3104fb34ee03391e00c47899282cd59348fac4c3e511eedd96501760053