Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0380ac190e2366a…

MALICIOUS

PDF

90.1 KB Created: 2021-06-26 20:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54b72c1e65b25ba12afb20a50aad920b SHA-1: c4b9d0443d679cc918319f044dd3e0c7271309f8 SHA-256: c0380ac190e2366aa59c469502126b8f4712613ae176d47ff56c91001f9eb4fb
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=case+study+diabetes+and+insulin+signaling PDF link annotation
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d996a475bc33055a696fb46313844e26/32724817465.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1038f2150---77053810352.pdfIn PDF document text
    • http://chapelguild.com/images/usr/kexewexanumafumukiwapexe.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/cb97064fd878d8054373ccff73f9662d/vetewive.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf532db142---lenozewugegiti.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a25d2b8a53c549b69d4e695abe787ee5/juzireva.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/gaxufuvedi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/9705323949.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d884d361d3---40286653376.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e0b222310d81dd4e5494c1b30cf16f86/ropovatagusamizekikexazeg.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/69823301832.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/nowugiwibaxavatik.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3cd08b7a---42590023543.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716ffdae811---26590369524.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8de06913---85821406587.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/11726470203.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/felurolavexosudizeba.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609263e23443a---31123509629.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8ee83d816f89c57ff38b4c5630cd87ae/xazakibivolewomorusixip.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/936b29c8332e2a75f46de7d6d787c1d2/59574654455.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/66331004231.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7bf2cf6433ada89f81c5c25055766d34/wigamowesarefokovagenapoj.pdfIn PDF document text
    • https://medlineplus.gov/diabetesmedicines.htmlIn 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_off0000ff03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 16792 bytes
font_01_sfnt_off0001171a.bin
d612f097ff298fdd72148a92c66e949d4c154f3ea456cf51127e6defea1b94c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 10588 bytes
font_02_sfnt_off00012f34.bin
a87d6753fd62e6ed8ec83e3b7ac1cbf94c36fd80823cf0315faa08f7ae3a26b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 17096 bytes

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