Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ce3da305b585be…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 18:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 391aa855f6d057ab73d22ff677019e3c SHA-1: 8e21858d03f96eb33e361c76f40a1c70add79ca5 SHA-256: 45ce3da305b585be9d8ff5d901451fc03e4fbf7036ce7ee4ab63a1150a3b6a32
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the nature of the detected heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/34ac3a37d5edaa8ced144b3b383a4aad/jisosokilukedi.pdf In PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jazazekodadose.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/f2nbnatpo5rm43tcfsci3ejacp/20261158653.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/32170985073.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/5a0tu50sfvoealrg0oeaf3tdf7/jezevewif.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ed1337c91835245a78e99390af19d416/7942564534.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621854471.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/73454394063.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/l45vtf4m3s56lh9u4loc0rafp1/vevenabej.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/sutifutoxilufe.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/witisi.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/fiwabavipizotasa.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/48544901963.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/folurofudexufuju.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/69651087.pdfIn PDF document text
    • https://andrejc.si/files/file/sitokoki.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/60074bdb9bbbef955405b015ab60af3f/visalaj.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b558a5c68f7---25773123352.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/1493024920.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/sajeleredamejupetumodop.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/dufujolujurexutipumov.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/fabibarujubifigeketa.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ue15qjvdhrl9aem1f3m26961cm/70342206448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=aquatec+orca+bath+lift+user+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_off0000c7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D8 17696 bytes
SHA-256: 051e913959010329f64bab85c7611af0bfed87db9843c57d9b07b8c77de426c7
font_01_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 10968 bytes
SHA-256: f82becb8afe6bf240fb8aec46a5262045ca61513524ce7c19fec39802c87f203
font_02_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1