Malicious PDF — malware analysis report

Static analysis result for SHA-256 92589e72f0622218…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 10:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f0b8422d16a835f9b0259e8fa4e9f43 SHA-1: 9526ec603f8e733a05a477da2ff8d028aab541af SHA-256: 92589e72f0622218a06d649344de51bda8bb16f86da79fe6e8b293c4a2063737
164 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of a 'download button' heuristic suggests a lure to trick users into downloading further malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pappteam.hu/userfiles/file/77642301442.pdf In PDF document text
    • https://ladangmimpi2.com/contents/files/24781132375.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/09842cd0f79154bafc7acd892f2a39a5/tirojumalujolire.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/bonavaminu.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/ditetixumu.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/72309189881.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/geluzoxatabopibolux.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/lusuloniselu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e59d057a75b799dedf9efde5764aa865/risugugimobi.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/94895099463.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/pedozolojebulokuvir.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/ranotebufogukotenogazun.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/97908377890.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-13/20210913113732452630.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/fupobimi.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/dakor.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/90043863892.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/18238642643.pdfIn PDF document text
    • http://princeverma.in/uploads/files/6886109092.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/47128383256.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c73737ceb---44670058764.pdfIn PDF document text
    • http://centromp.it/userfiles/files/wunesokuxuvogurip.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d2078e5824be19ffb25487e841b3952d/zerisutamokofukavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tekken+3+apk+full+versionPDF 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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 10644 bytes
SHA-256: 3614b55f21e634536370d0c7e6d5c4b2742da265b7b63a0774fb185c3411ebd8
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 17924 bytes
SHA-256: e283ea53094ff614c8d435af312d9840fd751232e50665f1c306d924c921c34a
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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