Malicious PDF — malware analysis report

Static analysis result for SHA-256 e836b49492ddb703…

MALICIOUS

PDF

92.1 KB Created: 2021-09-22 16:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dbfe92abd80d2f7a034aef8362bde0b4 SHA-1: 7c6ebe1a83edcf78d787ee6022ffe3bf8198f4dd SHA-256: e836b49492ddb7038ae776c238e97c8b62d11f27c6d3bb4080aa4d94ab9b8cc6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm, with some links hosted on disposable domains and others on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nhatngudongkinh.com/upload/ckupload/files/falej.pdf In PDF document text
    • http://fcgo.tw/uploadpic/files/60366580396.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/jexamibilabuwap.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/66074029139.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/katoleliwaxekawunigozi.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/bosagomajefuvudetuditejo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613afed96643b---torirazukebipokaruxot.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614970e7d1071---gigex.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/neluzobafapabararegine.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae7e0922c2---62994815699.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/26501664446.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/busofesuzolemepukuk.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/tofepufumelema.pdfIn PDF document text
    • http://holzweiss.at/wofepuxa.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/kidawijomakomefifexi.pdfIn PDF document text
    • https://combrooncom.com/contents/files/37334633167.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/fekoroja.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/fasin.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/karazenedonivapujogafin.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/wexojageroponu.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/27670352821.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/75902890902.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o3i0ot84v6fgbso5qrhupet0s7/bulanurutuvisanev.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/parosukapelomaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=free+movies+without+signing+upPDF 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_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 17228 bytes
SHA-256: 5db97d655ccfc596f43c58aa312c1b9cf9e5a7f157f8575e938a9db1b0dd992b
font_01_sfnt_off000131f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0B 10720 bytes
SHA-256: a9c67ad70832d4c4871bfec387a50832abf9fcf614655967688d596e0cc92f72

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