Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd098da3a7f5855…

MALICIOUS

PDF

126.9 KB Created: 2021-09-06 09:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 051c8f1ce9c507f2bd05a075ec2f45a2 SHA-1: 7c5e87b7192b7e53d5d981c48b342b9fa8b93d52 SHA-256: 3fd098da3a7f5855ba88983f54d1a639cc54b9130dfb03668efcec9f081bf9ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

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 http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210731_040011.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d8alpt96n984i4csf39fa38176/vodoki.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisoluvaduzutik.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/zaralunabadimuw.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090b34bc1bdc---mogizilibokilopo.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/sepitevinix.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/29369603637.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/13687773212.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/1088605088.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160813e2aae33a---bakagorejirunananufudinet.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/vazal.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1cccfe84c0c7075df7374919b6882edc/98638690085.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44256968133.pdfIn PDF document text
    • http://saktigroup.in/uploads/zatoki.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626492cc34---69496978266.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b594cbfb37---36369888949.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/30362836717.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/34905578847.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cffe231ff---dufigabesobuni.pdfIn PDF document text
    • https://baglab.pl/galeria/file/jedekiwadef.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/gegodakuvanifefaxerara.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/zatafu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6c77kcts8eicvtf54ebrre6676/bebefivewolojid.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/41031621981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=codigo+civil+y+comercial+comentado+ricardo+lorenzetti+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_off000180c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180C0 23432 bytes
SHA-256: c4e894e236464c768e3da5e10fc17f41cf3787b0b5b80cd9a8b620f86e766052
font_01_sfnt_off0001bb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3A8 11068 bytes
SHA-256: ce7c4f208dab221159068adc495b3bfe9364ccad98e2462220f62f2966bfdbbf

Open this report in the interactive analyzer, or submit your own file for analysis.