Malicious PDF — malware analysis report

Static analysis result for SHA-256 b683536f7797ad64…

MALICIOUS

PDF

80.2 KB Created: 2021-07-04 13:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 63287b7ad30d04b8ff8c5ead543bb186 SHA-1: c06ef0d546776f656270a0633cfd5c6a035770ba SHA-256: b683536f7797ad64047ce66f8ed6f60e5de437a196bd97cc082f59ba08f29477
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised websites that host further malicious PDFs. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest an attempt to obscure the true origin and purpose of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/6021af09715641c07e5c74ef637bb829/1839992143.pdf In PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e36b38de64---tatopo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d215644d21875e6df3e4a68aa58ead82/wusebezoxafatuwitabikov.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db86eab176---viromo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/xeteva.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ftb2873g8lugluv80lqml5ujct/gekekapapugaziduse.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/91194587433.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/vkj2n6ppvf9vai6bhrakfoguf9/83092164476.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b965f907---90400809696.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28118064569.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcfa94e86b---zajetunekov.pdfIn PDF document text
    • http://healthywithhart.com/res/file/gotike.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/88139529431.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/7da5cde0e548955650453726e7b9abf5/zikujezereposigugi.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7b156b70ec26727ced3841821a5b6f05/93040257825.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0f6d4174a57cb42d36b24e6c23c39399/78525252965.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/69200776193.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32a21e503---zimel.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5b6c9286bcbd5f6eee4fbb876c10cd79/mavudafemejivamef.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/79663682491.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/72617567003.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2b00ecd6b1042897ef9690609858a6ca/fikituzopodimojoba.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/58091161383.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/23a06083acfcec79108db00268c391b4/kemekakenesuzavosizuz.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/14343963444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+save+a+word+document+in+pdf+formatPDF 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_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 16300 bytes
SHA-256: 4118171f95f4823cef92ad7b2058ded75095505bfafcede3d692352cb42d875d
font_02_sfnt_off000119a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 10976 bytes
SHA-256: 46d1fbcb686560a3fe8643839fa94dc02ee38a0b0b9fc245713fe6b0d688e1c8

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