Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c785b0ccd03d178…

MALICIOUS

PDF

106.1 KB Created: 2021-06-17 15:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1ed3b364292207ddf20e352b8dffd814 SHA-1: 1e8f6cdc18d943886d20198b26e9c779882e4242 SHA-256: 7c785b0ccd03d178299bfb4ef8691ececcaf7c0e500532a37c7bde6a45990585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document body, though obfuscated, suggests a lure related to 'animal crossing amiibo bin files'. The heuristics reveal a link farm strategy, utilizing compromised CMS upload storage and disposable hosting to redirect users to potentially malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with exploitation for client execution, likely leading to further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://creptiles.dk/userfiles/file/gewenafodide.pdf In PDF document text
    • http://naturalmis.com/userfiles/file/41469211692.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0c4ef3dea287b7db4c59299497c8c8cc/63153818985.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6366f85c09---20731692061.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/88098628259.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d0b057721e063d58faedaa50d6efbba8/nutefevutiribukan.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160adedf22f051---27578561450.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e3f32d9ea5dbf0e823e70938238801c3/43097610900.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/ravesitosetalo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/53a8a7f779113f40afbed0244ebcff4d/patekekitige.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afec870fc4a---10761031581.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0c4ee4c8---vonafuzikewuzumil.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4kql0k0dadob7ontovpbs1tcd1/wasugogoboposuzukimimub.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5hul0dqaf10kn57tu5mtbkeork/goxemepuwar.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/87455331356.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609656987363b---48201059184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=all+animal+crossing+amiibo+bin+filesPDF 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://scripts.sil.org/OFLIn 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_off00013de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE4 2880 bytes
SHA-256: 80960c5ef920dc812f40421d0c41ad5272b60f71c1256c1bdf7a11afd8d5b2df
font_01_sfnt_off00014821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14821 5328 bytes
SHA-256: 85b0af19a5b03a0f672e0cd7b3efedc8ef66d3015f3b941f97b947cfa765714e
font_02_sfnt_off00015a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A27 12432 bytes
SHA-256: f1b0f4850b735afafd9d489a66fab80dfe661ce43cee47696aebeedb655f6838
font_03_sfnt_off000183bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183BD 16204 bytes
SHA-256: 0318b400cbd4eb80818b7eb131bcca2e18f343f850c5eb1573e525fea31f4d56

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