Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e10195d2633e37b…

MALICIOUS

PDF

77.7 KB Created: 2021-07-04 14:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 388dae059796783d2359a4c0b7b7e816 SHA-1: 0192527c762ec186725abf4ed79902eefe96f4e0 SHA-256: 4e10195d2633e37bbb1e02bc2883de999421b666babc635d6547d4f66280f4b3
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=red+blood+meaning PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d3a1fb10f43b3d0457dfb6670557a409/82731823693.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a413c676b95---23452880767.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef86c7a29---52836845223.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/votidegokekikofidazewi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607507dc35a08---jiluvudinefujipuzuzadasel.pdfIn PDF document text
    • http://skupka54.ru/upload/m/tukitibebiwuditipogedodaf.pdfIn PDF document text
    • https://andana.us/files/files/togaxalepurajavejis.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/53864496995.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099da418e394---11787966748.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nivelejudojiji.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2b5d8778670bec45ded9163c9fe7cb2a/vazan.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dbaec3841---30992531448.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3262abbed1---kumezubebifujebupapujepi.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/83549733976.pdfIn PDF document text
    • https://saam.vn/images/content/file/lelokuxabugabal.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ed1614f69c37e3bff6ea490fe48883fe/82883612197.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0ef3a4a3000755d8ac49bcf5b255dea1/finotabawelokogowogapo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b244a99bfa7---xaniruw.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d472296cede---88481580497.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a5g23niijkf0k0pr3lcc5uj9jr/97009115162.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/51436208236.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210620_B26CB24E681F6B79.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE16 10408 bytes
SHA-256: 1b7c30bf397eb7a1a7bec27898b56572d2ef0ca69f19a2359188f812fd3387ba
font_01_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 16796 bytes
SHA-256: 289b0682749bc49895bf3041ebcbb1dfd56792d14323dee8bcdb82a160371db2
font_02_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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