Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba2d871e4d11307…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 18:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03d8bad5dc193fb0ba868f6cb334c96f SHA-1: 3def9fe67effed76f57bc220361e7ebf5efe368e SHA-256: 3ba2d871e4d1130781ecee884e7902136e8dc8cca6d8ed1858cdaeb79eb421b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://blsautomation.com/ckfinder/userfiles/files/xijod.pdf In PDF document text
    • http://mfahk.com/upload/files/todezufinok.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210910_E26A3E67EF600272.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137437f7451f---30836756271.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4bb03900---12568079891.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac8a00293---kebezepufalo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gubopareta.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090920261073499.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/5349433295.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/22653983972.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/fetupakepijeximofebivegu.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/82382463482.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/nimolubugi.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/67037790154.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/sugab.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210908082454.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/bomadivijudexidi.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/67563413300.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/5418949066.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16136645a76f52---54265072884.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/45151794438.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/17052671089.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/83025047574.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/mevowimewowomedut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=candy+selfie+camera+apkPDF 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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 18652 bytes
SHA-256: d0b391e73b7a40aaeb62b5af9e1f3de06c23ac392c349df977a1b4de8ddf1a7e
font_01_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 10800 bytes
SHA-256: 04d816a2edbcb67873a349da66358735ff940c75608c86830a8720e0ad9117d5
font_02_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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