Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebaa2b7e1768b1b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 23:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc20036192dd4c5a1be6e3d8c1ef866c SHA-1: badb45bd68471963038e4ef985b148dabc0e8373 SHA-256: aebaa2b7e1768b1b70ef8e4c646b12a33b5cf0ca22cd627c69626d8482c8f8d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to trick users into downloading a file, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=field+agent+app+download+for+android PDF link annotation
    • http://www.sictombbi.fr/ckfinder/userfiles/files/rokijetisuxufeletunus.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/todalofaxafopegatelekabij.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/vasudonejibofufazijide.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/64390910561.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/25333832437.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4251c213---48497268021.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/16840888426.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a1ee055e37f5738e17c2bc8d194c7564/9305066958.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/45759208788.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/14569482015.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/podinitixegezuwe.pdfIn PDF document text
    • http://afro-safari.com/upload/files/327597297.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ac7b75b17541441795142fcb2a7089e2/tepofipuleluvozeda.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/surolatapenuvogid.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb49e8bd8---jejidajixemokexo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090700583279.pdfIn PDF document text
    • https://ratodua.com/contents/files/94682388466.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16134ade0258ed---wowizenomolefugupiti.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/58441932730.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda18de155---jegukanivogofada.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/72354137542.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/84786785469.pdfIn PDF document text
    • https://isosklo.cz/uploads/muzepokufosonolesekul.pdfIn PDF document text
    • 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_off0000ba07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 16472 bytes
SHA-256: d142b6e83dcd3c8fe760d0774281fff03119db0368c800e926d644336fe5d1ee
font_02_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 10568 bytes
SHA-256: bba5c3bee0db93d9a0feef6e131a308f5093f60ce25d69fed2e564aba48ff66a

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