Malicious PDF — malware analysis report

Static analysis result for SHA-256 8983a546d05d2242…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 13:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26bb8a5fc89113ef6b53ef8df1586372 SHA-1: 7b4495c91e814dd34d37de03a8de055ace07e436 SHA-256: 8983a546d05d2242ec8cabe3bb3fd877b543173c02a7ba33c19947e4207e9443
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristics identified multiple links to potentially compromised CMS upload storage. While no scripts were extracted, the structure suggests an attempt to redirect users to malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/80730617314.pdf In PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0uokdlnsfiemsn0lf43d32r7of/38553187363.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/77714481971.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/rugujemepazolusidufap.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144ed107b83c---xubenovomunelorukudipuj.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/sivuj.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/dewikoxofikidelujajif.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed42d8b1c---nelebibusejuresexujotimi.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/90600453467.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/82531243715.pdfIn PDF document text
    • https://ratosatu.com/contents/files/89415309995.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/wekobopo.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/99026187731.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161329ccc95412---41236295727.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/safirok.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/11703846194.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/kapikuret.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/10511258875.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/lotulifizalevepagefesovin.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/b73adb174eff91a0598dc9e8066a8890/59450937784.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/bubiwozozepitek.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/47381432634.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/29944385815.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/xekogodiwejesekoluwusox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=esl+reading+comprehension+exercisesPDF 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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 10948 bytes
SHA-256: 0a441337f23c214d7aad22b84d77d954c4888a84fd909f567adbcb9f45ec0b06
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 17752 bytes
SHA-256: 4d92372b901e36ec81d4c4d59595e6b6884cef1c1451b0d3ee716c391028b239
font_02_sfnt_off00011f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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