Malicious PDF — malware analysis report

Static analysis result for SHA-256 277949430f062acf…

MALICIOUS

PDF

89.6 KB Created: 2021-07-17 19:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 804844f465dec57a5aa8fa602d339a1d SHA-1: 0804d10e3b4dd9fbf1c81d71fc6e4015cb1b0647 SHA-256: 277949430f062acfc3fa2cec61dbc138220185b9a910f5b9d37649e91f49f495
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised domains and link farm heuristics supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c6f1343b7f6611151b7e89d2dd40cd4d/3358889862.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb023220230---67134290316.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/p7q9bh251967qn03taa5qf6dob/45130924231.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/32576990038.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa0fac6d0---daluzubobiwofuliremijobir.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nelopagipamukegozidar.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xowotexijunagepa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d0aa0251---gelojenumilebupemu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/509771234f78678a077c7ae1f829f90a/32620338214.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ganodi.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f9d935adb---5161100490.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/59607406224.pdfIn PDF document text
    • http://elm3rad.com/file/radegij.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f1426353d5e1bd197380a7ac508b64c7/jalomowu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fe09966d791cfb1e14bee186e9d7dee2/bebare.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/uughjslmmbbcicqqletfnuikec/ravabadisowedaxalemalo.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/17539538977.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3abdb9562---gewaxedil.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/vogiwuwewisamu.pdfIn PDF document text
    • http://parentini.it/userfiles/files/14782030679.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/650d90e405290959d89a45a5e664ee06/41995129373.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2af98796af333af4f1fc25bb6d571911/sanazem.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/vatagejanejiwutiga.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/ronezikut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hebrews+12+commentary+macarthurPDF 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_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 10960 bytes
SHA-256: 9523361b2e12b34c4c5b60ee729c541c8b5f6715fbde20cbd651d110ad34fa18
font_01_sfnt_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 17436 bytes
SHA-256: 8039fba010c1dfe5b2d2a3550927966a27fab40756b8116c40c2108d379c22c0
font_02_sfnt_off00013f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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