Malicious PDF — malware analysis report

Static analysis result for SHA-256 19011cd65e46dd44…

MALICIOUS

PDF

116.0 KB Created: 2021-07-18 22:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91d18e07e294900cf7c814497eea4c65 SHA-1: 444d8ae17623cb4e97b5b6cb90bfe3e3a2ff4f64 SHA-256: 19011cd65e46dd44a4086ba711e7d94fb597a0f136c4127fa08f20ddf13910f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.mmalappeenranta.com/tiedostot/files/najulosuratinifosaduwagor.pdf In PDF document text
    • https://mauspro.net/upload/files/fagopufotuxatizopo.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/dalaboromejefe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gaikjcidbi7dhi0lj8f8415qq7/tozitatukukede.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b228a08eef5---17046399901.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bbd4f1a3f---xagevuzamelagusuvo.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/54233281281.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/2593803593.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f72f17664222c7a1d97d91830e9ececb/7001421200.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/13fee77d162293239d12dac8de584202/18695855912.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/sps0fa2h3b39s78vc198jte3o0/90647332312.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/19050893845.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/28b5af60ee1b51ec582af67deee0614a/budunipemewelenapefazam.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2daf556605f02b0c4e8f42d3be7f35e9/befesadus.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/11e5b408953ce69c2379caeb2236e4b4/xalupitituke.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/padulilareder.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/70594857417.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160876d02a5aae---kizumux.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9c6d6ad4---nugalufivosegodupi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c9c92750---8370368880.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/vi1l15s98alvas4ffjtlgo3212/mekovirozovi.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/luxapapurosiga.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/rogezugunewuvidafez.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fb5cc58cb---39299535508.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5348e1f9b8---vesigatufanuriranixaned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=armitage+install+in+kali+linuxPDF 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_off00014eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000166c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166C7 16088 bytes
SHA-256: 5f75525109a44ee407122063e533377bb670263fb67541af9fc6115546547b33
font_02_sfnt_off00017bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF2 10608 bytes
SHA-256: 94c8a75acd4309e9ebc8937517d1a65a5ff336a32edba69616ecbf1c12094da5
font_03_sfnt_off0001942e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1942E 17520 bytes
SHA-256: 0837c472026c82d67c093d23da6800a0a2855ed1f114f08e1f7e9d1bbe6ca908

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