Malicious PDF — malware analysis report

Static analysis result for SHA-256 b507eda4e8be41c3…

MALICIOUS

PDF

88.7 KB Created: 2021-08-26 17:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1405711019fcb61f191a32628cf3103b SHA-1: 4bdaf7723e9e5875e64082e29fedc0fffe1976fe SHA-256: b507eda4e8be41c3762549cdb497b6f0aa55e13418dca6302c535b0bac786729
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs suggest an attempt to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://ailizia.com/userfiles/defibamagutalirowo.pdf In PDF document text
    • http://mrukseo.pl/userfiles/file/29712609159.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/707ad4e5c962751a9eb4b2176b5bc493/xibasazazojirakozuxik.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100f7c5c23bc---zofulitoza.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/lojukapevu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6772e1818ff0d9e6de059004f414470e/59804601661.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/22689598192.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/80900116624.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/fc92b46ebfe20c1aa11bc02f2de6d492/voporojapajovukolapeb.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/dotuwagavak.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/48224124358.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b292ac55f---vuvofuxorude.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/48667364507.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/golifixagerutalo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/34f599ab5ec5283e0ca5b9514b398105/60827375112.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072943eb62d5---35559511778.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160983811620ea---dumedixakasedonatenurum.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/wumuduv.pdfIn PDF document text
    • http://byecook.com/ckupload/files/fudojej.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b20d36f2112---19016298617.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/42461663728.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/7rbgerlg4s4ngg4mj5b13amq3n/gadilixikosoxenunina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ventoy+macos+isoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f3a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF3A9 16272 bytes
SHA-256: eb41247562a323202b4859aecbacd41f9ffcfce0e78defd6eceff6e6d7aa45b3
font_00_sfnt_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 10328 bytes
SHA-256: a75cd8f1d22a2c1aaf0cdd141afe3e5663e2ca3b0d777f61af2435fb7d7f9257
font_02_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 20952 bytes
SHA-256: c8731598ba355203e6dfdc538ff1e3340a0a40c57cb873b2e30973abc5abd2ef

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