Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a3e6f1face38d7…

MALICIOUS

PDF

97.1 KB Created: 2021-07-01 00:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b75069b7cd95d06ef8277fa9b42155d7 SHA-1: 1ad148180238c23e54282665a0c8d55f15911e51 SHA-256: 32a3e6f1face38d7e2cb18c12e8aa5e449edf8808ee437affe9cadf6eba4eec3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://mynigaoe.com/upload/file/20210514194602.pdf In PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/bijobudewarijomuzado.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d625ebd75---91082178912.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc50e8e8247---laraximugavesami.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/59652164996.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tr6s15k48d4n5pbl918406o8ee/4454514610.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/tozinitobutaselagus.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8b4e983f4dffbd7eea309b97cfdd12b4/50725912266.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/16c7badd2e53c24bf2b44ae13809d150/23915273808.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ho9gdfkh8tnnla4qus96f9dhf5/sanosazafegim.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jedug.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be720aa3012---rovololivu.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/31112521991.pdfIn PDF document text
    • http://halmar.info/userfiles/file/15110154860.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ee05df2b9092406cc747f4a9556e6ec9/gafetexa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/a2n2qcautjmb7jt1sa8seskp85/siwiwirotav.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/72061838106.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/lumalese.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/aa9ddbdb4c447997c083109810a3f6e8/ligibuniginirekakilekakis.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16076354ff030c---78466227370.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085da0fa897f---73603793038.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/26026851906.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/518c7ef9a2abae0984a4a6da8c3e1575/vizolugutugogesopujata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=motivation+life+thoughtsPDF 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_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 17884 bytes
SHA-256: e8310e79939c33d88be4017460e34b596abb931a4b6dd5e8aa0534ae26982615
font_01_sfnt_off00014749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14749 10552 bytes
SHA-256: 44901bd0ca9eedd70708f9d82e9f7d49f38573d57b1d77e5c41cac2319fb984b
font_02_sfnt_off00015f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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