Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bd30538705eaa6…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 14:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a783ca844cafaf7ae8cc08b6c6d458d1 SHA-1: 062e86833ca892597379a743924b3ab7798295bf SHA-256: 32bd30538705eaa62c014aea8b3b10f165468d953dc5f784adcc92270e8cc6da
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML_NYX_PDF_MALICIOUS heuristic and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM rule strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://noclegsosnowiec.pl/eurostyl/photos/file/89717507082.pdf In PDF document text
    • https://mcdelandes.ca/uploads/file/20142333411.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/40220104836.pdfIn PDF document text
    • https://eravikulamnationalpark.org/ckfinder/userfiles/files/42170902527.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/20701729916.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/27710123561.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/13077675087.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/bumuwoledufufufujotut.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/9624739337.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/tolerunasoz.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/63615333989.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/31548054362.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/624548719.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/gavefufototedubezix.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/22287773363.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/88097985610.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151339362d60---30771752747.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/widepiluboluvisizefimukos.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/lidiwigipusemotunef.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/bovolirewawasopubobolemub.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b505a342f0---73000891086.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9f2aa9da3e6172292443a62533e7fd69/40018075298.pdfIn PDF document text
    • http://strihaci.cz/userfiles/file/begiramikodepuwawimutot.pdfIn PDF document text
    • http://nprofit.hk/userfiles/34950836442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+import+contacts+from+android+to+simPDF 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_off0000b286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB286 14296 bytes
SHA-256: da46e55565012637b6a10c042af15f29fe9cf10e7859792051f0b126a71a87f7
font_01_sfnt_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10680 bytes
SHA-256: d448be643c6ade554c91354d34a981a1b5375a1854f6cd1cfc349415da9237e7

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