Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1856b50973b471…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 11:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ef649fdabac832e1e06c95e564ef8b8 SHA-1: b9ac52595cb29253f6c2c682101444dfa5a99906 SHA-256: 4d1856b50973b471884864295c14ac4a561ec3b465d8dd490812a503e7940379
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF link farm heuristics suggests an attempt to direct users to malicious content, potentially exploiting SEO techniques to mask the true nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nhatngudongkinh.com/upload/ckupload/files/55242450458.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17dcc7fe0---zenun.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/jepogusowababud.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/32491c3874e8714bf1e87095b0034a2d/togomujoxumopanavadore.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/4662300515.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4437ef7e---xatidebelisuwoxizuxogaku.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/17309332776.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d7669876b7ae0c98d8b9ec361c914d81/toruzupanewunudodo.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zesopejolap.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/20804064820.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/563576f45e5cf7758422b8edc87c78a1/zukuxugul.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c9750bce749---lasobetupimitejefizin.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/vukavanovone.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/38562865481.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/tamatep.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/qpivih2fubfauinr6epfnuc0om/siwabesujopa.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/fewezokefasivazeseg.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/vebusijezexagusarukigij.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/8843071076.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/kirimale.pdfIn PDF document text
    • http://www.bash.cl/media/file/resilemowolizasaxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gondwana+university+time+table+winter+2019+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_off0000bbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 11664 bytes
SHA-256: 2dcd2420f844b9a11a1e413144e9010262ababadcc02da4e96e3c410299163eb
font_02_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 16872 bytes
SHA-256: 38b5e8be32ea8d2f61e9429c59fb25a1a0daddaba53f7a742592c7449b86df06

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