Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31e13c71235a244…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 14:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2d782cebacf1867a052b4806be276c3 SHA-1: 1f02964ffcd6d0892e2c221dfd526eeb1c46d9a9 SHA-256: d31e13c71235a244ff38749732c1a3bd2ff9141af4ed663ad8b6854cfc40dcec
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. These links likely serve as a lure to download additional malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://takramaipai.com/mypicture/file/nivugorawitowibixadamu.pdf In PDF document text
    • https://etcbt.com/userfiles/file/foloseleki.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/89537848004.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2k1cr1dblcefclmbdkdqeqqep9/56460543134.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/napuziliwerejumikegi.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/82409828639.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/zutufotuzaxudelit.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/jeponuf.pdfIn PDF document text
    • http://scro.ru/pic/file/ziferokovibolir.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/xarimu.pdfIn PDF document text
    • http://m2m2design.com/userfiles/35483297219.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d72d15011574bfd8ce6c3ee4c77d0c54/sujutujuninax.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/ziwijatugu.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/pelipopuzupexomubetixixod.pdfIn PDF document text
    • http://cortabellanews.com/userimages/kedezogeba.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/18185593.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091117203642.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6921ac60c126c27acd8730bb353803bd/rijoxazurusolewonuwobodi.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xijomojukuxepazenakoso.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/legoloxepapeberarezoko.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9e7c38735---diguvuwepixofifadefa.pdfIn PDF document text
    • http://rts-3.ru/upload/files/zivenugumetaleke.pdfIn PDF document text
    • http://ombs.ru/uploads/files/wugubomejaruf.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/zumuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=among+us+live+lock+screen+wallpaperPDF 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_off0000be6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 17264 bytes
SHA-256: 262062fafb99aead48d1b886ca65efcad5a5278cd2fbb8b11f34c70960ab4103
font_02_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 10944 bytes
SHA-256: 1cd706a4edba95710fd0716f07aa2af0a88bfbe2d4ac3cac6ca70fe835e2b27c

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