Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ac877182daf705…

MALICIOUS

PDF

109.3 KB Created: 2021-06-18 20:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7303fcbbd900b59a6c5c0c4a7480df95 SHA-1: ae4912d01251f3c3bfda44f79deb85439860272a SHA-256: 54ac877182daf7059c511a5c47fcae9de8261e71d1c34f73ee3f654d63d29716
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure and a seed-phrase/secret-recovery lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://orgue-chantepie.info/FCKeditor/upload/file/vifosetasatoz.pdf In PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/fupukivuwadawanekew.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7ga6ot51gg1ko1348cm9j8mj36/28871662946.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2bdloq8rvgkd4tk5o7su1a9akk/64598995769.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092f3c942b83---67748250780.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/76823228800.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/d4fa24d55e80900b9aba35ecaf174b14/76147459885.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/001b20d9223b75bac2457d4cc1d32cd6/51479023864.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b85efa21799b151c6afaa9ffaae8bbbb/99655900001.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210601021537.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7870d4918c0b30ac37bd033e63ca6152/57225695911.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ae7212ea9f2bdc784347a7fad8a92a3e/sonefuponirodo.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/71144725792.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923c26c1d41---62476588250.pdfIn PDF document text
    • https://doganagolosa.it/file/54793063505.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/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+booter+panelsPDF link annotation
    • https://gofile.io/d/ReIHBfIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00014b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B09 6568 bytes
SHA-256: 792e288023e4fbe73a0351c4e4cf94c19217598e688914c0413f09f13c1160d5
font_01_sfnt_off00015b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B56 4908 bytes
SHA-256: ce9988b2de79f05ef1853d1ba4c3caf43ee0ff715c8482bc950ea236fe26bc36
font_02_sfnt_off00016c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0C 11116 bytes
SHA-256: ed780c78a6faa82d714f1f1c61df22663fcb57a4271be489d11765e28be8bce3
font_03_sfnt_off00019238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19238 16116 bytes
SHA-256: acdc7345fd7c724e0f83f99756c334a81566d7f1ced1780f830934d9e28cbf4f