Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3e7a257e89fca0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 09:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14e409102da20c2aec55ccae2890c999 SHA-1: a298cd6957620b0d260850fe6775ce9bab0bfa50 SHA-256: ef3e7a257e89fca059efeafc84db6fa8c409e74a68fd5c77dcb5c52218826ad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://malabarmail.com/ckfinder/userfiles/files/8457913478.pdf In PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/4646588676.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/mebeneruforojotuv.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/26599398404.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/55ea9c8de52f49e656f7b5cabd3d68a9/gugexopimoteruvidopi.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jegibupenidabikutodabo.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/26487764214.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/32610870432.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/36462903581.pdfIn PDF document text
    • http://oodow.cn/upload/file/210912152315895402gp6x3bwabjs5.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091117181173499.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/35363963468.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/50855116142.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/9527857250.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/18453558310.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/44681853014.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/jelixiwiwazil.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/43407043334.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/80573188778.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/sigomizitatefiloxedife.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/334ba73f47199544ca4bcdff70363a70/wakibetenaremaben.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f577a38a---lujunavujobepizofuwe.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/87265695684.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12535960096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=funny+moving+out+memesPDF 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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 10400 bytes
SHA-256: 9f98430699c9ed7501a58e3811224bc1a523a3ac13c7ba932bd41bcbc128eb37
font_02_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 16916 bytes
SHA-256: ce080e47a22869955e7e9f22ebf149185e2788b6bd503446d7b6bd7787fefb2e