Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3a4909c8dae30b…

MALICIOUS

PDF

93.0 KB Created: 2021-06-25 16:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3c2243f34f190d9757cbed93400c1aed SHA-1: e4c9fd4adc4eda2e01c4bd3c7b6a02556ccddbac SHA-256: fb3a4909c8dae30b6240049896d161a583acfb550ec2af7a0065a8b4a6defdb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=final+fantasy+xiii+duology PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92cfda51dc---fefexofigiziveji.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fedb7d10063d6c113e906007b129cc00/kukojixejuzewew.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/davenojijabudex.pdfIn PDF document text
    • http://berbun.com/user_img/file/doralujifasonu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5218476d3---rexulawakotebon.pdfIn PDF document text
    • http://abpaluso.com/upload/file/86049249167.pdfIn PDF document text
    • https://retta-bg.com/userfiles/xumezoporuzadifetemaje.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/28944992396.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5067a36759c67919421378e23562f344/donujevaliguvutisiledari.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed24a8c292---37429445020.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a454a6de5a6---miwixekutaxid.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/34784862580.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/58409596251.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03346029cf---karagapurevezodabusu.pdfIn PDF document text
    • http://midel.me/userfiles/file/86756627219.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/0fi0pf22cgjiq47dobad6pa5la/53859401869.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gtq9nh03r9i4b0oecqugd617im/5920894417.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
font_00_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 2472 bytes
SHA-256: 93223be700885c2154785a96f0b04097ad05eeca3c8126a1a02d20a2a6d4930b
font_01_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 17016 bytes
SHA-256: afa8379d6d5ca1cb2208c849c148d4e258d55636df0d370a44d593caa0a53fbf
font_02_sfnt_off0001351a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D31 10592 bytes
SHA-256: 5af848efc8f03ebb576171ca2d23f290b001baabb5ab2e66a53d722d6d1c3f49

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