Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5758152c30bbe1…

MALICIOUS

PDF

88.6 KB Created: 2021-09-09 10:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3688524b0516524e741794e9652aef40 SHA-1: 08440eafff1aedc0862df7092511fa505a15d551 SHA-256: ee5758152c30bbe1331eadede9398a14953e0c9f9c1cfe198d28fd1d3dd1620c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download a second-stage payload. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest a phishing or malware distribution scheme, consistent with Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://kitapkapla.com/upload/ckfinder/files/37280607079.pdf In PDF document text
    • http://umrllc.com/userfiles/files/50596925388.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70170549295.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/wasotojaga.pdfIn PDF document text
    • https://kede.org/userfiles/file/fotukitaxipoludexopep.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/29034270713.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/64474278102.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161359f3ef17a3---zetemiwodulunefizu.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/26805885224.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e4d7b58f307dbcb2b73ef55827e0d27/tuzoli.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/kupoteveridimamelexer.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/8567172604.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a402e7f1c4c0f6ae49f870f0cf9014a4/pufisasib.pdfIn PDF document text
    • http://kgmda.com/upload/files/pabagoliwenuf.pdfIn PDF document text
    • http://okun.su/upload/file/76426283216.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/90677714395.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1613952855bc0a---wabugezanuxodewuw.pdfIn PDF document text
    • http://snft.ro/media/file/kawilirubol.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/zesalaxeterakorebuzejo.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210902061528974.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/dakobakonutodinow.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dab035ae6e720562d7faad6e2efc119c/43352836685.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/98595353375.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/2803476658.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210907084753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wwe+smackdown+game+apk+free+downloadPDF 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_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 10944 bytes
SHA-256: 2cfd5ebaeed7e979523a6911a110ea1e087a6deffbd7ce3db76e8ff49d18a299
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 19308 bytes
SHA-256: 44db99c6b244ee1c0660db9e2cc96e19539c441fb41d907ae22749afc2171af8
font_02_sfnt_off00013cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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