Malicious PDF — malware analysis report

Static analysis result for SHA-256 970afccbeacf7085…

MALICIOUS

PDF

85.4 KB Created: 2021-09-22 18:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec4d3cf8b03c4361aac19601176b6061 SHA-1: 55e4e93d4f2da4140ab27a4ef44e01da75b5201b SHA-256: 970afccbeacf7085e4adcd1bef020d00f51f611a63118f76af56ca7638b46473
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document that impersonates a cloud document sharing service, a common lure for phishing attacks. It contains numerous external URIs and links to various domains, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead the user to a phishing page or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://wastran.ru/uplcv?utm_term=manage+storage+android PDF link annotation
    • https://stichtingech.org/ckfinder/userfiles/files/vikobibezusodedas.pdfIn PDF document text
    • https://onecre.com/images/content/files/61362805247.pdfIn PDF document text
    • https://anjingliar.com/contents/files/xinodotitobikisew.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/vibumotuda.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/83511733200.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631569984.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/dabukuniwibifozogavuj.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/lenega.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138f99ad06b1---tiwid.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/wivaroge.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134d94b7b575---59065821767.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109201046248879.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/miwiwuvimozudexebaj.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/67588408911.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613caab7e74df---87287502806.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3d9538b56---suxivakonosijoketatebubag.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/rozam.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161402e2b0602c---28399583267.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/nininubamoreris.pdfIn PDF document text
    • https://thegmsbihta.eruditiontech.com/userfiles/file/5924275712.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c8e6a7c9---33509414081.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/xebugagewaxotibol.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a9a9tuql49lr2vimhv2jq4gn23/doxurexidizido.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090516445573499.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wawameladikebefopekuw.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/44552443033.pdfIn PDF document text
    • https://edex.co/userfiles/files/zimuzowaxisotaj.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/499d6a8fcfe3dcf357a6496fe317ac8d/81912760797.pdfIn PDF document text
    • 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_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 17700 bytes
SHA-256: 08b9361eedd58442d4eb47c603f793f1377fd59f86a62ccb7cb763afb4920638
font_02_sfnt_off0001307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307A 10368 bytes
SHA-256: d5e27e9e686134f1e4f4e7b3811ce92b38ac418fd4fb1503a860330210572563

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