Malicious PDF — malware analysis report

Static analysis result for SHA-256 441592f64c9c1131…

MALICIOUS

PDF

73.7 KB Created: 2021-09-10 15:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84c853e3c879ac2f4e6c7c4fd1955c9f SHA-1: 8e0e66c8a0bfd67fa95168bdb72b111ec1d99535 SHA-256: 441592f64c9c1131de1f25bfc8b7448ad63df3df001527ec132aa58cc74f2988
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous URLs pointing to compromised CMS uploads and other potentially malicious content. The primary goal appears to be directing users to download potentially harmful files disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://peaceinsrilanka.lk/userfiles/file/57410092437.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jl2vidpljpchai0rqjkc83m9v5/zefajalajurexozajaxat.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/28809581801.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c291901c---73206956380.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/i2n47r33gdr99t0fd89m4e9oi5/3514269633.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/92095848889.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/40984092876.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5ca06c81---65393702619.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/83813211509.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/sekuburelemofu.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93240506949.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/xadajuwufedososaf.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/rekanekogufubexu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161357550b0b63---zotenotosujevefadinomux.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/lepegubixe.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/3977696477.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/16614881732.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161318e760b412---molixirilugojemobijixa.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/gager.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/17642024452.pdfIn PDF document text
    • http://domplus.su/userfiles/files/1398444141.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/ladidewabibexuw.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/zitulomifo.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630494947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+drastic+3ds+emulator+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_off0000bcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 16492 bytes
SHA-256: c60b88c41d3a6bff8c5cb0fb32936284a0f66aa941ba27756620d8e427724cb1
font_02_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 10996 bytes
SHA-256: cce455ef71a2976f4f6dedb0800004781adc41d8fa02196f7d3210fe2f9d059e