Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba5978a61a079ee…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 06:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e5cd1380d92e6aefd054fb1c8fd797b SHA-1: d87cb400ac5ab38b8552c9853dc288325c337da9 SHA-256: 0ba5978a61a079eef07c94ffc17dc60e48a80e3f7666e2f871cc2f72469c0c8a
156 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded URLs suggest it is designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608462a327d21---62079491956.pdf In PDF document text
    • http://crescentcarpets.com/userfiles/file/nipamuwaduvelutenevorabo.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///pizerexosurezeniwuzuk.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d061d287---81073135014.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/xaguluposixovalekiven.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/86994052123.pdfIn PDF document text
    • https://bem-sa.com/img/file/33363798800.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/74db76a0705fd787b30a771ae2dbe3ba/futafadapevuba.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/ziditetaledodefikimedona.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/rixozo.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/63401930213.pdfIn PDF document text
    • https://motecx.com/images/file/vuwifesasoned.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210522150631.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/7242340079.pdfIn PDF document text
    • https://biocoils.com/img/file/jivazepotaralexaliv.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/23648859168.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/pigiduzat.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb9f93504---2425197744.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845235d96f---wixoduxofojagudemisakegi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adc81e9656d---24726339420.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p8l7b710kpvllav0dhhpimb9k3/85009837947.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/336fb748f14bbafb7784c5b97ada6374/tafidexukadabe.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/12696023753.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9a2bae97---pimilegurilosovewelef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=modified+sarnat+score+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BD 17352 bytes
SHA-256: 9f081613c0dfd00972d523586a55e60decddb2c82dcc27e547c6329784df0db6
font_01_sfnt_off0000d3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16424 bytes
SHA-256: 28f6097d5e3d8a607e2485ae5444077b143399dc3b7df8e5d9d1be2f12104ec4
font_03_sfnt_off000115b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 10560 bytes
SHA-256: 1abf54746bb268ab8b47aef9613235ee5073aad082d263afdf06a31605f28016

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