Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a44ad741b7fed8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 23:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4845a8003e6436b66758c25a11b933e0 SHA-1: 2db591fcd65982ad63d9de3aaac852edde57f0f9 SHA-256: 31a44ad741b7fed862531e96e4001a5d83466c6d0027d1efc9ad2dd29511457d
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lead the user to a phishing site or a download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec5bfe4ebd9b886b3acddace64199c75/7604768422.pdf In PDF document text
    • https://efsanepin.com/calisma2/files/uploads/gumifadebidaxixuxi.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/pisimepagefekikaduje.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/13218875832.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744627acf75---95160495503.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7e8a8154c2f28af4be636e2f69bceffc/25865371248.pdfIn PDF document text
    • http://clerus.hu/files/file/39051867550.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/15183457100.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/motutedesopiwanaliri.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/kurifilexitizuzadobawum.pdfIn PDF document text
    • http://air-ned.com/uploads/files/72298809443.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/42317954924.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/5653066146.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/30236727567.pdfIn PDF document text
    • http://sergeybazarov.ru/file/98736367914.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/teviwijoxiveze.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210730134707.pdfIn PDF document text
    • http://reunionfamily.com/clients/6/6c/6c58f7de0247188f02debbcda007d80b/File/bajeginakasuwatufujarew.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160edbc752db78---60515878371.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/40754157602.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/sdauavtmo9loo921vrg2us0nv2/damijovigufojulezeliv.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/77981239879.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c3fedfa1---ralevuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sharp+refrigerator+repair+manualPDF 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_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 10812 bytes
SHA-256: 58f1cbd9a13fbe83eff3b81e1635431e26a19e72bf93b554774e34a930924418
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11703 18116 bytes
SHA-256: 08310274fa551b9a4fc5e78c42d8f0639d96286c89a49d20b68f8420884b012e

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