Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcda67c64fd8bc7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 06:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 503a42cfa17a4e20090987f105dca2d9 SHA-1: 22262d7a92dbd666d4016563e07d66ffdec41b17 SHA-256: 5bcda67c64fd8bc719ed078b2a71182852ca326acc551450ecd476dd9277beef
172 Risk Score

Malware Insights

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

The sample is a PDF file that contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content or download further payloads, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://flairpens.ru/uploads/files/79804611565.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/oe2ua7qifug0sknh39pg2kr37l/vubesusoxiwikoj.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/gojeji.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/13497838740.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146b9ca6a4a4---pujativ.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d19d8950a---99085062738.pdfIn PDF document text
    • http://irths.com/upload_files/files/xelokojepukepokiduniv.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/25033560954.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210914105522.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/50854665868.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/31008446788.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613469d0310a6---kepowiwowodidozek.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/65406648095.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/lefefejekobipowarovuriv.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/43855685294.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/46500417228.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/84992608001.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/4549551417.pdfIn PDF document text
    • http://horvathortho.hu/tmp/31034996449.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/1037249321.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d92214a1f0---safupoxotofeluso.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/doxok.pdfIn PDF document text
    • http://gaudi.tw/upload/file/rigoxizefavokamegotugi.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091617315680554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mcpe+apk+for+iosPDF 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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 17492 bytes
SHA-256: 5398382501175afd9d8b9d667207f64da2966c2e428c2561a6e9f840f5bff39e
font_01_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 10308 bytes
SHA-256: 00a61d1da0cfdf343def8624e9c3dd851c0d23d70d97e6e1bbfbccd6bdb03571

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