Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f253f3ad67ed029…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 09:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbe11f31ab36854f96cbbb153b8b714d SHA-1: 06e0763b90d4a01293b2c030354f422f165f7ad8 SHA-256: 2f253f3ad67ed0293b5dee88ab408bc6484a203d331231880620b9a76f2404ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=android+duplicate+file+finder PDF link annotation
    • https://nieruchomosciturystyczne.eu/files/file/46998407800.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161378f034ff97---9585669092.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jmc16oi58u2mqiobub4cojbba3/35123125004.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/35441830469.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/xokafoxolejejap.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/22761726323.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/41883723352.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/zinivixafipamufawiramunev.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/41567010287.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/ferolakavazedonux.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/zekesagadanitarodajesujas.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/48515117524.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/21080726022.pdfIn PDF document text
    • http://dsraxys.com/uploads/82358058824.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fologufana.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/vorezifibofumabowo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3a81fd665326976c365f7999813dc74c/44817931448.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/75725370958.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/32115400724.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/nexebebelolivavabunomasi.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/84232273506.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/63713676190.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acbb542ecb---ximimosunadufir.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_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 10528 bytes
SHA-256: 5edb8c34baa1b69c729576cdd457dc3ab67db74ac2ada09d32231b66f92bc18a
font_01_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 17960 bytes
SHA-256: e36c23ea81528f2513634afa67d51d61f9d80dd1e809a4fc141ff222c397b6b5
font_02_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1