Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a92e03f5d28520…

MALICIOUS

PDF

85.8 KB Created: 2021-07-30 13:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 896a8939ddc7cd07a7d1bfbbbefb395d SHA-1: 7a0facd6d4e44d7cb41b43bd71e5dfc4a23e67a4 SHA-256: c5a92e03f5d2852075855ee01a3dff8be91305cf6e74f7577a15ac7531a0be05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as phishing malware. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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 https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g8p1mjhq7shovcig6psur9fdp6/romejumizexabagis.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608264138fea4---zekepusiw.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/10210405189.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/jaragitur.pdfIn PDF document text
    • http://metapolar.hu/tmp/97676151220.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210508112336.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160fb241b69b6c---vetiwufuzewop.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08bc4dc86---61637424356.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/16220158529.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c218a89bee32546ca53a5ab9fb9b8fae/xubujire.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/gigaf.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/wofuvoka.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/g8cfi5nllun4c2kjkh8njsie8p/16448107082.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1o5ekh13u75e328f9a5brmr69u/13761688111.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e333eb68f96---17304167516.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/podekomezujadur.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1623450334.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/22335758902.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/5746473566.pdfIn PDF document text
    • http://efrex.cz/files/file/refibeb.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/65192371286.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/26305521926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=chronological+order+text+structure+videoPDF 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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 16852 bytes
SHA-256: b9decd07df6b7f016400e2a141ec049900eb4d2dc2b4f5227372c8f56b9b0cef
font_01_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 10948 bytes
SHA-256: cb7c1214368caae99b8926916f117b4cb282b73c0c333e49195b7bc3275eb33a
font_02_sfnt_off00012efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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