Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8de0d1152ceaf3b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 19:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c14a8b2ca781ee8f785ff39a7e461817 SHA-1: 622a0361ec52eb946106af169f9f3505885c2225 SHA-256: f8de0d1152ceaf3bd49836980be1c55f41cdf520a2cc69f101ef88e8f00da312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that likely lead to malicious content or phishing sites. The presence of multiple external URIs and compromised CMS upload links indicates a deliberate effort to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://drafthe.ru/uplcv?utm_term=worksheet+writing+numbers+to+20 PDF link annotation
    • https://palezieux.com/ckfinder/userfiles/files/45045037503.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/jagixanixidej.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/32022593756.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/1956830586.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcafd6158---51891818817.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/708a483de751978903f6d8daca8f0b2f/99773672348.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c27fdd296f2a8016c029c81d38913d03/vidugimigepamovixaga.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/8621249816.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/resukoveze.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/8a29c17b137093149b4944f7ad112889/95218668850.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/wexiguzuliwinutujevike.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/de5eb441b42010e447ef355038caf84b/razavo.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/lomuzidanaf.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/lotedif.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a20a22e3f---xuvunuwape.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6841eaf740f7324e3e775a8577829205/rijazojikofixelekijo.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/pelepalodazom.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/066fecde0b418ab3acab0b5d969b3346/junevatilagafizumigukax.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826a3eba51d---vomizamubek.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/pewuwiboribebepi.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e07a193fc---tujodelegidelevo.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/52488001657.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd83601d3---nalifo.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/xominajor.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/sabamujeronotajitoxikol.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_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 11000 bytes
SHA-256: 37b69bcca61c05e897b2beee48cae23b37a71e3ddd304ee8608216201213e8b2
font_01_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 17768 bytes
SHA-256: 5384af47da4cfb4afabb7e66ff37b5fb09e5b77194debfb663df190eac3d96bc
font_02_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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