Malicious PDF — malware analysis report

Static analysis result for SHA-256 7488736fd6b59c13…

MALICIOUS

PDF

116.0 KB Created: 2021-07-18 18:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f1e9df495290c99f8bd57c96689d3189 SHA-1: 86b0db412ec43cd3e240d3eb1ba9f3db169c34c5 SHA-256: 7488736fd6b59c1395d06d8fbe84b583850f148206d455a9981ea730d78bd0fe
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/1qd5hbsk78uf7hdhf9qmcamgr7/rekofixa.pdf In PDF document text
    • https://pypconsultores.mx/userfiles/file/6379111153.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94db53045---kazufililiguzagul.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/72218bcbd2aec55a523411e7377688c8/76958693393.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/54109804261.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/98366586606.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/da15bd300282daf25d89312c3ad764b9/zedenamobimug.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2b799b8d---zogomur.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3622a23a---sobapofatoravuji.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607628f0322c9---zinalozik.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cae9b57e4---tetanupaxevomitolexumok.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/99007491255.pdfIn PDF document text
    • http://climtech.com/files/files/xaxokiluwap.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/rofoweteb.pdfIn PDF document text
    • http://chinahongji.com/d/files/betisakedanefikenizataneg.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab376de8701---gokanuputagodafuf.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc65edcade---72338653273.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a2bc49891---61761087951.pdfIn PDF document text
    • http://metallpress.ru/files/95859146834.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc1310343a---56373859422.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/065af7f47b017bbf79087d8b22e48a74/77351286404.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/teroforutifezewutawowep.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210628065740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ipc+sections+pdf+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14450 18456 bytes
SHA-256: c0d397d75b7aa20a046e33c703f9d07a9bf33bf8fb451d6849ae7d69f5538273
font_01_sfnt_off0001742b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1742B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C42 10588 bytes
SHA-256: 33fea7cb88b0bf93f622a0efe09bfac79b252d0c6284eed8f3f3de32b1b57a45
font_03_sfnt_off0001a41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A41B 1820 bytes
SHA-256: 2d0b18e0a7015bdd6cb029bb6709e1599942adbb83b844226db827395ecd3a7f
font_04_sfnt_off0001acaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACAA 16088 bytes
SHA-256: 9097553d388de6ba0c4695ab3f5748207509627cf951ebf2c052ca71e31497d2

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