Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaa66e6affa6e4c…

MALICIOUS

PDF

87.4 KB Created: 2021-09-16 15:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 33756c0ee2beb507f75606b7b3b9d071 SHA-1: 729f75e63a1902b8fca5a2367bd62d3005b5e301 SHA-256: efaa66e6affa6e4cee65a5deaf57116d793b85ef23ba740393d1be1af95c91f4
136 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution attempt. The 'Browser extension / update installation lure' heuristic indicates the document's content is designed to trick the user into downloading and installing malicious software. While no scripts were directly extracted, the nature of the links and the lure suggest a potential for JavaScript execution or exploitation to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=agama+car+launcher+radio+app PDF link annotation
    • http://goksirkrupskimlyn.pl/img/upload/files/papuveta.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/14665765997.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/bilozegem.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141c09a4a75e---delopow.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/68277999856.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/gokudumefex.pdfIn PDF document text
    • https://kueapem.com/contents/files/48908634068.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/75559032888.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/38471238268.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/jegukovadobotajixozo.pdfIn PDF document text
    • http://ccadl.com/files/20210908075153.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/28399856763.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613af73017227---wapezu.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/fofibifakirekiwoj.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/65996227448.pdfIn PDF document text
    • http://air-ned.com/uploads/files/5802346423.pdfIn PDF document text
    • https://basisnomor.com/contents/files/96110385031.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/28291346926.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/31634304338.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/reninibofaxugevetigin.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/34330329596.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/jisupowimizejul.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210903031201.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7747a54b---81639264178.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/83264616183.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_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 10776 bytes
SHA-256: 5914b656c1be4d4b59afa9b41a1b4dadeca0d71d1f93a4e41645291796e3e7a3
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 19360 bytes
SHA-256: 8088d2f0a74919a3361e22f2b14ccc04e6b059e9092bd113e771fe93ef9ad8c0
font_02_sfnt_off0001384a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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