Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e76833517a7d397…

MALICIOUS

PDF

95.4 KB Created: 2021-09-05 20:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 308672624d6c8f95fac8f11004b6ccdf SHA-1: 75a90166e0a928b70b7edbf87bbefd5524496892 SHA-256: 4e76833517a7d397d0fbb9433ce45157cbf2ec06e19cfa0b9376671c80a338e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple links to compromised WordPress uploads and SEO-optimized disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/20489257451.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6ba89aed64f610b33b8a6680a8567e63/lekosezizobemapuweliwefe.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/3110a54013faa59f76c62217aff0fe13/56085466882.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/bebotidepolepulak.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf95febbe8f---66370226663.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/61975652302.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/232717c66d448874ea95a3bcc4a5da0a/98299217786.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089011577f6c---47385959995.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/71512387764.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/zokifuzigojezakefirapad.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lutomoso.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/gerotijimapikatekino.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/17959236481.pdfIn PDF document text
    • https://everestart.com/images/stories/file/bamazidanub.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/wuturubeguxofotofedit.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/73052416224.pdfIn PDF document text
    • http://matras-devison.com/upload/file/25742893078.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac73fdd3eed---mejuzewuvajinafedapawugo.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/6885318746.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/rf1iru6h2ura8b3gk9n6661jjn/58842504902.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e5136f89e4e---49929296717.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/43711853491.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/jurarit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=apprendre+anglais+francais+pdfPDF 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_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 21540 bytes
SHA-256: d94417d9e5b0c1ce92e32d98c0db9731f9e05f6027c39dcd3e1728e05de42b0a
font_01_sfnt_off00013e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E57 10556 bytes
SHA-256: 783b38975bae3328da1e5c4b1a9886d0786aa1e024f711eb5628fcfe58ced010
font_02_sfnt_off00015648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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