Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aebe418438b78cb…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 08:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e36316765ebc08b581d131bc73454c22 SHA-1: c9795996b7cde4f973c16c4313b7308a74461e57 SHA-256: 8aebe418438b78cbbe49ab86649f9935c41cd0308f9cb7203a938024c29754ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself, despite the unreadable document body, strongly suggests a phishing or malware distribution lure, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://pixomot.ru/uplcv?utm_term=be+going+to+and+will+for+predictions
    • https://ntct-dz.com/ckfinder/userfiles/files/zofobivireruxor.pdf
    • http://chikatere.com/Upload/files/lojokazexixofuvid.pdf
    • https://abe-rdc.com/userfiles/file/57546154256.pdf
    • http://security-m.jp/tool/images/file/tofulaterapofekupogiki.pdf
    • https://nikosdimos.gr/userfiles/file/jesadavefagipuwejaxew.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/01f46e811bd8ec81e5b0a6680d620f36/52765118360.pdf
    • http://fdscience.com/UPFILE/userfiles/files/zideraban.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/i6cahakqgccus50gl6f1g93cki/31796591939.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb1cb61ba---subowenasazobilolutun.pdf
    • http://pnmanagementsolutions.in/uploads/63571678766.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/57f6cc134443055c42d1c66aed85a84a/medefisagulusewewapo.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c6831424075---togigumuwegewemitamizik.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/83cee25e2ff3fcfd16780b357eca591c/pumanufutopeselonoli.pdf
    • https://luyenthitoeic.info/userfiles/file/pevivinakewolofagopuxuba.pdf
    • http://pincailight.com/zk/UploadFile/file/2021061502132873499.pdf
    • https://naucharts.com/ckfinder/userfiles/files/zumazoxulewubefogopejela.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/78557934163.pdf
    • http://musorcentrum.hu/files/article/file/9247603677.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/23cf4325fa7d99f6c074705cd1832200/5894043665.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847503b2d1c---lixok.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c36ee4c9ac---lakiliratulodu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1dd.bin
2d625a93e9a429b63091697e45701ba80d2f5112f8023eb49f613b2334b2560f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 17732 bytes
font_01_sfnt_off00011062.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 16792 bytes
font_02_sfnt_off00012879.bin
747d3e956f51bc85d44856f5da0172cf853e1eedd41e53547fa037d7dbede847
pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 10936 bytes