Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d2be62cc18f0c0…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 01:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d5fcaaa6c5aca9065c887a2ecff891b SHA-1: e4a758d2634e1553177fb6b3df7eda2d20c0b6c7 SHA-256: 54d2be62cc18f0c0babfa18cd50a81d3f7161d5a7157d4313bd0a7f27fa076df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL findings suggest it's designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://taikenplan.jp/ckfinder/userfiles/files/56859233281.pdf In PDF document text
    • http://asckhn.com/acskhn/userfiles/file/xalazakesixi.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/40782168710.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/57747629517.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/paboxopijazuwazizib.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/pizuzinobew.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/godiwutufepugilile.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/694025690.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/kuzukisoxovupese.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/lakeviwigizijetizovasulo.pdfIn PDF document text
    • http://silver1979.com/upload/file/mefawabevopexamir.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/77091920938.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c142d3a26f---lonetixojotabej.pdfIn PDF document text
    • https://thehouseproduction.net/file/gufemajogaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f271ff2c28---34289866911.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece480ee12---robuwelawuvefagamoto.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/82155180463.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/7779005911.pdfIn PDF document text
    • https://10fci.org/userfiles/file/pebusulurefokovi.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/43818856703.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8622150d---zubazuxewilevixivazav.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f11ceb275a---vavusuninunuxuv.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f314668c3d05775496ce90ec6d14deea/detubobunurajezazuxigadu.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/beporapaxapedon.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/78149355637.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c67c407cca67931f6c7b8577bd9f7f88/romute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+among+us+live+wallpaper+androidPDF 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_off0000c4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 17060 bytes
SHA-256: 743b4be60aa3e6c82ec46b697bb1ffa900f7c5d1162038fb3e3697ce89826b09
font_02_sfnt_off00010974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 11072 bytes
SHA-256: 40c42f027cc6c44fb6673b06f841a7da5e8767917cc50a13944fcc96537864f5

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