Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ebfba033419f0e…

MALICIOUS

PDF

90.0 KB Created: 2021-07-13 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fce95ba08ac786029db5ea38f0e4418 SHA-1: 772393df7f283e8537b0bd9bc973acfb44647e25 SHA-256: 95ebfba033419f0e0132906615d1b3070a553fa25024b331e4871349e9ea0075
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic firings point towards an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/53eqrt48qr2u7pk4j8765o337f/21502478693.pdf
    • http://xahscw.com/userfiles/file/18025202037.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/femevafi.pdf
    • https://equantumconsulting.com/files/files/99247144177.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607705904aa0c---xuzekososagusubisevixiz.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/31887244645.pdf
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/73824638507.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/895360c464a13b22fe1cded2228a5d73/93051648036.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0ff9733sbrurc7be3ud37ep1ns/63384192700.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/d6a7669adc00a37f0aa346c48df98d01/bemiwadekop.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c63da92790f---dekovixetabupirave.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/073a39ca0c8669f4963fb88333a3e4d2/87404120399.pdf
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/vusemuz.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/23710092515.pdf
    • https://diaochue.vn/userfiles/file/98249871511.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f43c0d6ba4---raroxe.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/neranoporu.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/kffidtjatm0lrp7ul42cnvghtl/76600726738.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/23b0d2c4ad0f8831196622b4415cf93f/89459114800.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7a8670f6279f3d18c1bcadf6cc432430/79201913850.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b9e86bea0---zedekibo.pdf
    • https://inncredel.com/uploads/63228640476.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/jezepewipaviji.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/dolurivawokemuvekavoxef.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/3b05039bccaff25f175d74ff367bfd07/wejikulamij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hot+and+fast+brisket
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa71.bin
1a299526db50347579f6007951c44d1a2dc6dc480f685ff0d5ae3a745e899a0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 18380 bytes
font_01_sfnt_off00012aad.bin
69c3665ea529afecb0d6a3404c5227e4e8b3e533b9c809ccee9a25ea155f4473
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 10524 bytes
font_02_sfnt_off000142be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142BE 16792 bytes