Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b12c5bc4dceaba…

MALICIOUS

PDF

106.7 KB Created: 2021-06-27 17:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 966bc3c2db0abffce2934060ba8a31fc SHA-1: fb8219b9518f471906540138681688862585010b SHA-256: e6b12c5bc4dceaba5889e7294adddf3597a5e71a8e7553e4b72276237e866712
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to lure users into malicious activities such as phishing or downloading further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=understanding+points+lines+and+planes+worksheet PDF link annotation
    • https://summit-christian-academy.net/scauserfiles/files/89514092094.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a855ea7258a---61796912926.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/da8c265e9b5fb41c35217e75d61634e1/51154903952.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f0f535bc6b963c1531d4e009b3459faa/wowupasu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/patufuseviruz.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/55471896128.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/p839n0kvfvarbea5fj22sjipc7/fivaluguzotusetesujevima.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adc845312e2---34980104050.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/39689561116.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f788be212f---nekukokawovi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d2b8ae462---kaxazusufakawimufenov.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160750676c1735---letavurimo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a387026f389---5172868672.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b269a4378a---62498988925.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b64bf9a4fe35190362f3bd75a22f0f5f/81944587492.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6e1183bca---1049477665.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/837a16c1989a3adb37208c2c9fd6ef00/37913582330.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/zidafiduku.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/8uggtcfvugrpjcj4r69ueojeo0/nipopuxituka.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/89134076870.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7422afb38312b4b7f50007b4420ba5e8/jarutezatib.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160835d7038330---87538740712.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b192af1b7ed01ca4c2d79dc64495d4b/39036911109.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 10856 bytes
SHA-256: 0d5dadcdeb2039029674e66b266ec744d63d8dd26a26b811fc3431f53590e56c
font_01_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001443f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443F 21404 bytes
SHA-256: 5ef0ad56e12511125b2ac8086e36c398b26f19518459fa01f28a8383cedfe11f
font_03_sfnt_off00017d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1B 16364 bytes
SHA-256: 5623716e57cd293b12eaf41f41a48b1406c57b1abec7ee6269b1a1276f236181
font_04_sfnt_off000193a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193A0 1848 bytes
SHA-256: ab23ef642fd79bcc346bf5ade6fd261e9319e07c1487bd1f9137f677faa464b3

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