Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e01ff88d9b4dcd…

MALICIOUS

PDF

97.0 KB Created: 2021-07-08 09:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e864e3ba79cff12bc8989e083129a984 SHA-1: 86c181bfbfd4a775d7aa428f0c43975ea199ff4a SHA-256: 93e01ff88d9b4dcd54cc3c09c4c64b7b63b6256adcc5080a50dc052363bcde66
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1553.005 Security Software Bypass

The file is a PDF that contains numerous external links, many pointing to compromised WordPress sites and disposable hosting. The presence of a 'Security software disable instruction' heuristic, combined with the ML classifier and ClamAV detection, strongly suggests a malicious intent, likely phishing or malware distribution. No scripts were extracted, but the document's structure and heuristics indicate it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=cloud+engineer+interview+questions+and+answers PDF link annotation
    • http://01host.ru/userfiles/files/90398692735.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/funekaxiwapesoregeleluz.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d246cfaf6ce69501963225146ea8fa2f/47417141192.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/17172974261.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc442b83e---56986162179.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/32197804011.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c653ec7a540---47619015364.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/popanenatape.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081c65e3a39a---99937874128.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/82737880e4413d5b7ec2828c27a67ad5/61336272835.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ffc93a052add009c044704839f35e321/mamebosogawamome.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0d5d771a8---wipixopelugegudige.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/xemuxigufunodig.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c33fc1b5ad93822f6336b1073941247a/95163594715.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/68806523153.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c7792c956ef---wejaz.pdfPDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e195b77a9fc---31461916464.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ad1ts7sfpo63pkpv0r3d6oimp0/jigiwafudabigur.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3e74e32978af464aba5f580d2648e005/fuvutewuderuxekife.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722677bab76---zagadilokepopevagotivogo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d3a242b41---paxopofupofeve.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/kezosujefofemexagevi.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/zusuvibegodezuwe.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/27661452053.pdfIn 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_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 17648 bytes
SHA-256: 69b66d0f0b00a6749ba2092fc7e7320d99f002f1384750bf49913eb4c1d4846d
font_01_sfnt_off00014586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9D 10852 bytes
SHA-256: ab7b66eb8cd8b7632d96e1e523e97a43d441db1c1a6fb4a50afb55b48493037a

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