Malicious PDF — malware analysis report

Static analysis result for SHA-256 875d593ce80e9c76…

MALICIOUS

PDF

98.0 KB Created: 2021-06-25 15:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09c4a14deb6fb2e38a81fbdf30c0d257 SHA-1: 665e8e7a5f33c46eaf62dc5d47a79ff8aaf38cba SHA-256: 875d593ce80e9c76f05a1ed1e95c87a2771e2b9f5f27faafb7bc0b3958008273
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=thereby+meaning+in+tamil', are likely used to host phishing content or distribute further malware. The document's structure and the nature of the linked sites suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nomylo.ru/uplcv?utm_term=thereby+meaning+in+tamil PDF link annotation
    • http://koryosushi.com/uploads/files/19961922766.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/g54pm6o3uil3eq303tivmiaru6/ripozaz.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb66cf0d4---xejosujuzeseselufujazox.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u8247ldadepr3c65l5r321klj0/19341757199.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/44778439747.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/dezegi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ie2kq02skp2qjogf1qftjkvf2/42185198732.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb14ee34767---wutomilibuvusa.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff9777fb7---47669352908.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105130047423580.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/042229471333.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c867c102578---zuzamimipubenujitasur.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/naq7timn4vvag0hibb0fctm2fk/dexuwat.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b6309027650a195b55767123c1049b0c/62941416760.pdfIn PDF document text
    • http://2440027.ru/upload/file/19004520599.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4525916897---venerizu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4811809ad5414546f8532c9e5dbe5ce9/tanijevobakij.pdfIn PDF document text
    • https://avenue102.com/uploads/file/tusofiferenoramogiwe.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607428bc0d505---84513674678.pdfIn 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
    • 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
stream_004_off000117ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x117EF 27864 bytes
SHA-256: 00eb43d074647ab7104b8befa7e8671547fded44158647dd312e527a93a7465f
font_00_sfnt_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 10484 bytes
SHA-256: d3ff542d1cad2fcff3fea9d6e1cf35954ac49c40d7b70601928f4c4bdbb61067
font_03_sfnt_off00014aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA6 17624 bytes
SHA-256: 579cbfc758df12cfc0261170ae3c26f57dc431a41160d11cdd2c89900aff8d81

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