Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e983b37b7c8705e…

MALICIOUS

PDF

89.2 KB Created: 2021-07-03 01:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 38022b677c459fc03b7fc036868088fc SHA-1: f869d4986f142fa0021bc7946cfb5eba8b13c851 SHA-256: 0e983b37b7c8705ea16f79ca4a093ec12e7c6a0b260119b3c5b31e344b175388
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers confirm its malicious nature, likely exploiting PDF vulnerabilities to redirect users. No scripts were extracted, but the structure strongly suggests a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://longarmacademy.net/fckeditor/userfiles/file/zivubunuvono.pdf In PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e62b42006364680fd2fcf90f9cebabdc/8734824802.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d81adf8131aa098d1f0490cba0344ba1/16709934727.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/onbq947rbiv7hctrgo288rd9jn/davupu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1d78ckoe0qlafbi7m6c4teg9d4/75210002951.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a676e73aea5---63787158809.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/12919678256.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796e7f5b1a8---vajunomimaxito.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf5f82660---66673956874.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210622011907.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/mudebibuvuxa.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104300351162812.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pakut.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160742dd1c7a77---widaparaloxo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc50876294---xatajalak.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/96520283130.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/tgv5r20peai55f31qs5rl0bikh/givarosu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tunuduz.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/jokunejibot.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430124825679053.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/69412125169310cb9f4aa6e7a4834219/79374185477.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/zadubuwiwejuxumivarukuva.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e074a578348cbfec43333769da19ee5a/sibepifuxonofomate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=weight+to+height+average+chartPDF 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_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 17244 bytes
SHA-256: 2e435754cd297b3c152bce48ffda12f7d2e453b0926ec07675babf766e429f35
font_01_sfnt_off0001288f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A6 10248 bytes
SHA-256: 140a1a919facba8c3d31f86bd04329158f27d7a61e73d842ae24321888669a51

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