Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4d824ae409ffaa…

MALICIOUS

PDF

110.1 KB Created: 2021-07-14 10:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98856b5cd2eec4ffc151e64e7cf1c2d1 SHA-1: 215efcf78f43ed7c704449123cbabfcca78c0f00 SHA-256: ae4d824ae409ffaa17f0a2c9581da7070fce656c723751b27b5b0d90f2b1167d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, indicating a likely attempt to distribute further malicious content or conduct phishing. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the structure suggests a malicious document intended for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • 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://universal4shipping.net/userfiles/file/kiwabejoler.pdf In PDF document text
    • https://murten-hotels.ch/userfiles/files/70038390979.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa239e8353a---molonudokik.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb3cfab293---jepoxedoxopajetigokofoni.pdfIn PDF document text
    • https://argumentua.com/i/file/45247409929.pdfIn PDF document text
    • https://ivaco.it/file/supibidigagazorisodasop.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/504fc33b52abf94c61f8db219732903c/winizekofametulano.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9c1cd971a---61947011021.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/81262135069.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/vugowavit.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gmg23i0elktbcc2fj3pqemgse2/todadakafunutesara.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/54864825805.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/daxilitiri.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ec4ef1c8---14383549208.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/jafukat.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/44317304972.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b17ffc10d64---jukuwiwemilimigibij.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54778868b2---vasixinom.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/55558639965.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/c17f734abb98e667b9b16212b40fc09f/duzomunugetalikuzagag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=conveyance+of+troopsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000188a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x188A7 19776 bytes
SHA-256: aaf339a32d738e2b8ce28ac3263e70836247592c966a05c535b8be20e33dd577
font_00_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 26076 bytes
SHA-256: ee99188afd60f27072658b07417f5beecd7fa75075dac3dfc32c87f6417fd632
font_02_sfnt_off00015cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD5 10544 bytes
SHA-256: 0dd8782378c2d38fcd31ceecfc9e0c6349da293a07f60e648aae0fe286c9c14b
font_03_sfnt_off00017515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17515 5612 bytes
SHA-256: 2b290e1cf5744fd09ac00630404c8d310cb75145f831ced375c45c17d6032a7f

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