Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b73a902778348a…

MALICIOUS

PDF

88.7 KB Created: 2021-08-03 01:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fba1963060136aec66667e03e0a5df4e SHA-1: 61338ca046b62e62f3a8e0d0e6b7e869f53b5ed2 SHA-256: a3b73a902778348ad6e5932d8b9ac28f86652c7527bd91dcc8b08eb203bc98e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to lure users to these compromised sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2232e79ddd---53685911740.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160823b6d6171c---samatotafepatezel.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed54590762---92105932885.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ad007f0c20b---zetowu.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40bc516093---pejimarofik.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c8b779107a4e9ccfd86fa03ba747727d/xisowolax.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073c953a2bc8---89207283582.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/l6vt6lr0bo0tpfhtvm4qcn98c2/mutivik.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/mekanuruxil.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/574f802a2066da5becf5497178250152/tefef.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc69fca562---52379498511.pdfIn PDF document text
    • https://ienter.bg/files/40911466787.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c52b4a0c2---jewuloberefejekukijune.pdfIn PDF document text
    • http://benly-carson.com/product/files/xeweke.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d6008a8c3---durev.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/95466053248.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/xiguzikikum.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/dirudukimabarisebixa.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/84947288263.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0becb6f4---natedovovuzofosevanam.pdfIn PDF document text
    • http://langmypham.com/luutru/files/foviledoxotelikop.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073feab59bb6---31425173767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+climax+in+the+story+harrison+bergeronPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 17572 bytes
SHA-256: 5584a56163b5fc7dc8d8aec51532b21d01d3cd9eed4c68e88b2ad3620f34b880
font_01_sfnt_off00012281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 11024 bytes
SHA-256: 135e1544fda30e4e26a0e8cc69406f1266c39358877bf5fabcfb0cffc01f17ce
font_02_sfnt_off00013c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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