Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b9601d1872619c…

MALICIOUS

PDF

87.6 KB Created: 2021-08-09 18:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bde9a9a9b9ce7cb946ec9930a46cb22 SHA-1: d4a9ebb82024f47b6e2a3709ad6b876e589a4fc9 SHA-256: 61b9601d1872619c8535854c4217e2d36849947406013a478e502d18eb557653
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The embedded JavaScript likely serves to obfuscate the malicious intent or to initiate further malicious actions, such as redirecting the user to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/901e1ba96e3e06ca60e808a5dfbcd41b/49937000932.pdf In PDF document text
    • http://architettoangeli.it/userfiles/files/zetelopanekemum.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/gobezoxisevupakuzapanox.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d834bcb73---80028153155.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/vijopogufe.pdfIn PDF document text
    • http://4bx.pl/public/file/fotojexurakajomovox.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/netazutisu.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/mipikoripi.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7dff857e5---84999560089.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/90067316091.pdfIn PDF document text
    • http://unsersohn.com/images/file/52712953772.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/93967128000.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/7515527087.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/fabepotikixasaxaz.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021080815440570.pdfIn PDF document text
    • https://parkettworld.com/upload/files/tobuwi.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/pavonojutiridokake.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21e3a418d---63969438149.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b402c843---75936660448.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/1945782666.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3d5c43a1---67314683787.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/simifatowoxaxol.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1838af82---goxavoje.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/24435655662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=contoh+soal+dan+jawaban+siklus+akuntansi+perusahaan+dagangPDF 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
font_00_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 11248 bytes
SHA-256: 42b7194a2a211df41a49c1e2d051c5dae9c87df4fa3d18460dca8b03c1b3b986
font_02_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 1896 bytes
SHA-256: 5e6aece2f4f966ad8fe31d35004b7894a98e9fca0bf377849846755075656385
font_03_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 16368 bytes
SHA-256: 7f7f810f877f163dc3380408f0ac41cefbc34260fad23dc119151dee661ff33e

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