Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e24e39bfb3c257f…

MALICIOUS

PDF

111.3 KB Created: 2021-07-01 20:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8ba0101bbb4069879860ae778bc56a1 SHA-1: b490298eaeeffad5ebd4496cff7427d1ec489a62 SHA-256: 5e24e39bfb3c257ffea649fe6fc060d8f9af3fd48ecb44c7ab7d5e6a3e75d162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://ketchas.ru/uplcv?utm_term=indian+penal+code+notes+for+students+pdf PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d51af050---78589245694.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/18639681654.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/84458034292.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/49474680487.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/juvitipusiro.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/kugatavevamanuxinibezo.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5041mvqcjqpv7ivl0qog7fqdkt/sizudubire.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/fisolasezuledi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gafiwamu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fccf7bc541---zomitiguboguduve.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bl03rl68q2r9stc5td7md83bvs/59081635632.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/forofajewogejedobavi.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/jidoweran.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/zefakunafo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607764fc016a6---wovukojizu.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/28495338963.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3fkqirpk6r3j5q3130613d1gn3/90970670399.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/55181502310.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/gejutipobapovepumemas.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/sanumopowapetudalu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a414322d---66041947552.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16206127165023.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/fcn62cnqn3gd5d81cgu4j5ltis/79974786193.pdfIn PDF document text
    • http://abc-tel.ru/data/File/11516020047.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f8500336a6f8f4a46af61cc034ff261d/rononupumojumefibebetag.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000150b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000168c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C2 16944 bytes
SHA-256: 2afcc3c37c456575d546426588ac7958faa7f4ba54c513a07a76ffe937e8d827
font_02_sfnt_off00019536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19536 10664 bytes
SHA-256: 9d911f274c40c87f8513846c2fcfa9caed988e0a5c482f1a0636958d553154f5

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