Malicious PDF — malware analysis report

Static analysis result for SHA-256 78952b5a8cf9734b…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 00:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5a0fa48d3f3a81a38bb72939774905f7 SHA-1: 9b3704dee371806d86f40f900e221c478a84bc1f SHA-256: 78952b5a8cf9734b67ba78c630cc05b14460be9fa5ce572a5355499aa17c097d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the structure suggests a lure document designed to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://epilia.com/upload/FCKEditorfile/32007431728.pdf In PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/32015018902.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/17617122858.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/381pubtv4pa367sp90peuldhc0/wemejalefujebirovad.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nopuwupulupaserefomudux.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/xadinefebaruvimokununexuj.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8bb3fe5765c9a35993a027b2f93e32d2/4927655638.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/pikepezaredomozixu.pdfIn PDF document text
    • https://tele-video.ru/upload/files/73194054975.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/1418072624.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/mewezasupitukunafus.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210906_161600.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/61184130402.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/nokafogi.pdfIn PDF document text
    • https://citytrafik.nu/images/file/3277593087.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/21059328631.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/libibezavapetonizabitav.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210912051531.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/mujibanojupov.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/22953742381.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/85225627294.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5a67ed4af627707ff4f1cf223e0f35c1/5697142849.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/59086827685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+free+editing+video+software+for+pcPDF 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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 17700 bytes
SHA-256: 335b6118ee96963f3cea57816ba28d1b47d06dbc60cf0a4900a8106520531dfb
font_01_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 10956 bytes
SHA-256: 6bfa18becb5e8225f053072401f3ee5e03fb2e0d2704f18b46c98632ba501d2d
font_02_sfnt_off00013460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1