Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabcbe10718df7d5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 15:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2aa57dce9a6765725eb964f1ddd4e407 SHA-1: 0bb991d279351066972e7b0a8d2e7578846b32b9 SHA-256: fabcbe10718df7d508f5629c7606eb4284be75d13ae1e13f3e620f6faaa0331b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external resources, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=aplicaciones+bluetooth+android PDF link annotation
    • https://xn--80aggmy8c6c.net/UserFiles/File/47985943650.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/73294897440.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/26899119385.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/11364503811.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/941459119.pdfIn PDF document text
    • https://attack.lt/images/files/38138194722.pdfIn PDF document text
    • http://cichanski.com/Upload/file/rejiwuduvileworad.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/3431654519.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/78124858351.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091004072973499.pdfIn PDF document text
    • https://red-adlay.com/upload/files/11020720750.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/rozimezezarefifumawuf.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/pogubibuzakufiritav.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed7ccfce3---80580606598.pdfIn PDF document text
    • http://juha.be/_files/file/raxadulojazutuw.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/28659349974.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/pozikofawupesusog.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7e6206de30054398be4a64b46c03e079/jalogodofedopiti.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/90139825327.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/41278864798.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d03f9616c---jidopam.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/dijaxusova.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/44815518087.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/xafiralen.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16131390f6dbff---wopufoxomarugusa.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/jomibedabubatuw.pdfIn PDF document text
    • 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_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 10832 bytes
SHA-256: f1975727fbc02358e9abef688df9fae8006495295e1d82d2ff6ca5cc1feb8b20
font_02_sfnt_off00011627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11627 18072 bytes
SHA-256: 044c0ab0148f608f8288418f1e6bb71787ac594a83c83584d3e891683f45beec